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Scientific Data Documentation
Master Area Reference File 2 (1980)
*SEE AREA REFERENCE FILE 2 DATASET NAMES FOR DSNs.


ABSTRACT
Summary

 The Master Area Reference File (MARF) is the 1980 census counterpart of the
 Master Enumeration District List (MEDList) prepared for the 1970 census.  It
 links State or State equivalent, county or county equivalent, minor civil
 division (MCD)/census county division (CCD), and place names with their
 respective geographic codes.  It is also an abbreviated summary file
 containing selected population and housing unit counts.

 The second version of MARF (MARF 2) has the same geographic coverage as the
 first MARF and includes the following additional information:  FIPS place
 codes, latitude, and longitude coordinates for geographic areas down to the
 BG/ED level, land area in square miles for geographic areas down to the
 level of places or minor civil divisions (11 selected States) with a
 population of 2,500 or more, total population and housing count estimates
 based on sample returns, and per capita income for all geographic areas
 included in the file.

 Like the first version of MARF, MARF 2 will be available on a State-by-State
 basis.

 MARF 2 contains numeric codes and names for census geographic areas plus
 100-percent and sample data for selected population and housing items.  The
 file provides 100-percent counts for the total population, 5 race groups
 (White, Black, American Indian/Eskimo/Aleut, Asian and Pacific Islander, Other
 races), persons of Spanish origin, families, persons in group quarters, one-
 person households, and total, occupied, and owner-occupied housing units.
 In addition, total population and housing unit estimates and per capita
 income based on 1980 census sample returns are included.  Latitude and
 longitude coordinates are given for the approximate population centroid of
 each geographic area down to the level of block group (BG) and enumeration
 district (ED).  Land area in square miles is provided for geographic areas
 down to the level of places and minor civil divisions (MCDs) (in 11 selected
 States) with a population of 2,500 or more.
Acknowledgments

 This documentation was prepared within the Data Access and Use Staff, under
 the direction of James P. Curry, Chief, and Barbar J. Aldrich, Chief of its
 Technical Information Section.  Lawrence Hugg and Annette Ralston were the
 coordinators for this file assisted by Mary Ann Mandley and Joann Sutton.
 Support was provided through content review by staff members from Decennial
 Planning Division, Geography Division, Housing Division, Population
 Division, and Statistical Methods Division.

 The file should be cited as follows:

        Census of Population and Housing 1980:  Master Area Reference File
     (MARF) 2  machines-readable data file   /  prepared by the Bureau of the
     Census.  --Washington:  The Bureau  producer and distributor , 1983.

 This technical documentation should be cited as follows:

        Census of Population and Housing 1980:  Master Area Reference File
     (MARF) 2 Technical Documentation  /  prepared by the Data User Services
     Division, Bureau of the Census.  --Washington:  The Bureau, 1983.

     For additional information concerning the file, contact Data User
     Services Division, Customer Services (Tapes), Bureau of the Census,
     Washington, D.C.   20233.  Phone:  (301) 763-4100.

     For additional information concerning the technical documentation,
     contact Data User Services Division, Data Access and use Staff, Bureau
     of the Census, Washington, D.C.   20233.  Phone:  (301) 763-2074.

     For additional information concerning the subject matter of the file,
     contact Geography Division, (301) 763-5720, or Data User Services
     Division,  (301) 763-2074, Bureau of the Census, Washington, D.C.
     20233.
User Notes

 This section will contain information relevant to the Master Area Reference
 File (MARF) 2 which becomes available after the file is released.

 User Notes will be sent to all users who (1) purchased their files (or
 technical documentation) from the Census Bureau and (2) returned the
 original copy of the coupon located inside the front cover of this
 documentation.
Subject Matter Description

    MARF 2 contains numeric codes and names for census geographic areas plus
    100-percent and sample data for selected population and housing items.
    The file provides 100-percent counts for the total population, five race
    groups (White; Black; American Indian, Eskimo, and Aleut; Asian and
    Pacific Islander; and Other races), persons of Spanish origin, families,
    persons in group quarters, one-person households, and total, occupied,
    and owner-occupied housing units.

    In addition, total population and housing unit estimates and per capita
    income based on 1980 census sample returns are included.  Latitude and
    longitude coordinates are given for the approximate population centroid
    of each geographic area down to the level of block group (BG) and
    enumeration district (ED).  Land area in square miles is provided for
    geographic areas down to the level of places and minor civil divisions
    (MCD's) (in 11 selected States) with a population of 2,500 or more.
Geographic Coverage

    This abstract provides general information about the geographic coverage
    of MARF 2.  Detailed information concerning the geographic hierarchy and
    areas which are split by higher levels of geography is provided in the
    technical documentation section entitled "File Structure and Geographic
    Coverage."

    MARF 2 provides summaries and codes for the State or State equivalent,
    counties or county equivalents, minor civil divisions (MCD's) or census
    county divisions (CCD's), places or place segments within MCD's/CCD's,
    and remainders of MCD's/CCD's, census tracts or block numbering areas
    (BNA's) and block groups (BG's) or, for areas that are not
    block-numbered, enumeration districts (ED's).
Technical Description
Type of File

 Type of file = Summary statistics
File Size

         390-character logical record length.  The number of logical records
         for individual State files will be on the printout accompanying
         each tape.
File Sort Sequence

         This file is sorted by level of geographic hierarchy.  For a
         complete explanation, see the "File Structure and Geographic
         Coverage" section in the technical documentation.
Reference Materials

    "Census of Population and Housing 1980:  Master Area Reference File
    (MARF) 2 Technical Documentation."  The documentation contains this
    abstract as well as additional information about the file, a glossary,
    and a data dictionary.  One copy accompanies each file order.  When
    ordered separately, it is available for $5 from Data User Services
    Division, Customer Services (Tapes), Bureau of the Census, Washington,
    D.C. 20233.

    Metropolitan Map Series/Vicinity Map Series (MMS/VMS).  This map series
    provides coverage of densely settled areas of selected counties and
    county equivalents.  These maps are referred to as the Metropolitan Map
    Series (MMS) when the maps cover standard metropolitan statistical areas
    (SMSA's) and as the Vicinity Map Series (VMS) when the maps cover areas
    not in an SMSA.  For a more detailed discussion of the MMS/VMS, see the
    section in the technical documentation entitled "1980 Census Maps."

    County Maps.  The maps cover all counties and county equivalents except
    where the Metropolitan Map Series/Vicinity Map Series (MMS/VMS) sheets
    cover an entire county.  Most county maps are based on maps supplied by
    State transportation or highway departments on which the Bureau has
    superimposed boundaries and identifiers for most areas for which data
    are tabulated.  Insets to county maps are provided for some counties
    that contain American Indian reservations.  For a more detailed
    discussion on county maps, see the section in the technical
    documentatio entitled "1980 Census Maps."

    Place Maps.  Place maps are used for places not shown on MMS/VMS, and
    show map features within the corporate limits of a municipality or
    within boundaries established for a census designated place (CDP).  If
    census boundaries and identifiers for an area adjacent to a place are
    shown, the map is referred to as a place-and-vicinity map.  For a more
    detailed discussion on place maps, see the section in the technical
    documentation entitled "1980 Census Maps."

    For information about the availability of the above maps, write or call
    Data User Services Division, Customer Services, (Maps), Bureau of the
    Census, Washington, D.C.   20233.  Phone:  (301) 763-4100.

    PHC80-R1 1980 Census of Population and Housing Users' Guide.  This
    publication is a comprehensive guide to 1980 census data.  It covers
    1980 census subject content, procedures, geography, statistical
    products, limitations of the data, sources of user assistance, notes on
    data use, a glossary of terms, and guides for locating data in reports
    and tape files.  The guide is issued in loose-leaf form and sold in
    parts (R1-A, -B, etc.) as they are prepared.  Part A, Text and Part B,.
    Glossary (published as part of Supplement 1 to the Users' Guide) are
    available from the Superintendent of Documents, U.S. Government Printing
    Office, Washington, D.C.   20402.  Part A:  S/N 003-024-03625-8.  Price
    is $5.50.  Supplement 1 (including Part B):  S/N 003-024-05004-8.  Price
    is $6.00.

    PHC80-R3 Alphabetical Index of Industries and Occupations.  The index
    features the respondent's industry (employer's kind of business) and
    occupation (employee's kind of work) as in the 1980 Census of
    Population, Current Population Survey, and other demographic surveys
    conducted by the Bureau of the Census.  The index lists approximately
    20,000 industry and 29,000 occupation titles in alphabetical order.  It
    is a comprehensive list of specific industries and occupations developed
    over time and continuously updated through review of census and survey
    questionnaires.  It is available from the Superintendent of Documents,
    U.S. Government Printing Office, Washington, D.C. 20402.  S/N
    003-024-04939-2.  Price is $11.00.

    PHC80-R4 Classified Index of Industries and Occupations.  The index
    presents, for each category in the industrial and occupational
    classification system, the individual titles that constitute each of the
    231 industry and 503 occupation categories in the classification
    systems.  The individual titles are the same as those shown in the
    Alphabetical Index.  The 1980 occupation classification reflects the new
    U.S. Standard Occupational Classification (SOC).  As in the past, the
    1980 industry classification reflects the Standard Industrial
    Classification (SIC).  It is available from the Superintendent of
    Documents, U.S. Government Printing Office, Washington, D.C. 20402.  S/N
    003-024-05002-1.  Price is $8.50.

    PHC80-R5 Geographic Identification Code Scheme.  This report identifies
    the names and related geographic codes for each State, county, minor
    civil division (MCD), place, region, division, standard consolidated
    statistical area (SCSA), standard metropolitan statistical area (SMSA),
    American Indian reservation, and Alaska Native village for which the
    Census Bureau tabulated data from the 1980 Census.  It is available from
    the Superintentof Documents, U.S. Government Printing Office,
    Washington, D.C. 20402.  S/N 003-024-05118-4.  Price is $7.50.

    Monthly Product Announcement (MPA).  New Census Bureau products are
    listed each month in the MPA.  These products include publications,
    technical documentation, data files, published maps, and microfiche.  To
    be added to the mailing list, contact Data User Services Division,
    Customer Services (Publications), Bureau of the Census, Washington,
    D.C.  20233.
Related Printed Reports and Microfiche

    Listed below are some of the products that are currently available or
    will be released.  For a complete listing, see the 1980 Census Users'
    Guide.  The products may be ordered from the Superintendent of
    Documents, U.S. Government Printing Office, Washington, D.C. 20402
    unless otherwise indicated.  Specific ordering information for
    individual reports (price and GPO stock number) may be obtained by
    contacting Data User Services Division, Customer Services, Bureau of the
    Census, Washington, D.C.   20233.  Phone:  (301) 763-4100.

    PC80-1-A Number of Inhabitants.  These reports are largely derived from
    STF 1 and contain final 1980 population counts and historic counts from
    previous censuses for States, standard consolidated statistical areas
    (SCSA's), standard metropolitan statistical areas (SMSA's), urbanized
    areas (UA's), urban and rural residence, counties, county subdivisions,
    incorporated places, census designated places, and towns and townships
    in selected States.  Reports are issued separately for the United
    States, each State, the District of Columbia, Puerto Rico, Guam, Virgin
    Islands of the United States, American Samoa, Northern Mariana Islands,
    and the remainder of the Trust Territory of the Pacific Islands.

    PC80-1-B General Population Characteristics.  Data are derived from STF
    2 and include statistics on household relationship, age, sex, marital
    status, race, and Spanish origin for the following areas or their
    equivalents:  States, standard consolidated statistical areas (SCSA's),
    standard metropolitan statistical areas (SMSA's), urbanized areas
    (UA's), counties, county subdivisions, places (and towns and townships
    in selected States) of 1,000 or more inhabitants, American Indian
    reservations, and Alaska Native villages.  These reports are issued
    separately for the United States, each State, the District of Columbia,
    Puerto Rico, Guam, Virgin Islands of the United States, American Samoa,
    Northern Mariana Islands, and the remainder of the Trust Territory of
    the Pacific Islands.

    PC80-1-C General Social and Economic Characteristics.  In addition to
    selected subjects that are shown in the PC80-1-B reports, statistics are
    presented on nativity, State or country of birth, citizenship and year
    of immigration for the foreign-born population, language spoken at home
    and ability to speak English, ancestry, fertility, family composition,
    type of group quarters, residence in 1975, journey to work, school
    enrollment, years of school completed, disability, veteran status, labor
    force status, occupation, industry, class of workers, labor force status
    in 1979, income in 1979, and poverty status in 1979.  Each subject is
    shown for some or all of the following areas or their equivalents:
    States, counties (including rural and rural farm residence), places (and
    towns and townships in selected States) of 2,500 or more inhabitants,
    standard consolidated statistical areas (SCSA's), standard metropolitan
    statistical areas (SMSA's), urbanized areas (UA's), American Indian
    reservations, and Alaska Native villages.  These reports will be issued
    separately for the United States, each State, the District of Columbia,
    Puerto Rico, Guam, Virgin Islands of the United States, American Samoa,
    Northern Mariana Islands, and the remainder of the Trust Territory of
    the Pacific Islands.

    PC80-1-D Detailed Population Characteristics.  Statistics on population
    characteristics are presented in considerable detail and
    cross-classified by age, race, Spanish origin, and other
    characteristics.  Each subject is shown for the State or equivalent
    area, and some subjects are also shown for rural residence at the State
    level.  Most subjects are shown for standard metropolitan statistical
    areas (SMSA's) of 250,000 or more inhabitants, and a few are shown for
    central cities of these SMSA's.  These reports will be issued separately
    for the United States, each State, the District of Columbia, Puerto
    Rico, Guam, Virgin Islands of the United States, American Samoa,
    Northern Mariana Islands, and the remainder of the Trust Territory of
    the Pacific Islands.

    HC80-1-A General Housing Characteristics.  Statistics on units at
    address, tenure, condominium status, number of rooms, persons per room,
    plumbing facilities, value, contract rent, and vacancy status are shown
    for some or all of the following areas or their equivalents:  States,
    counties, county subdivisions, places (and towns and townships in
    selected States) of 1,000 or more inhabitants, standard consolidated
    statistical areas (SCSA's), standard metropolitan statistical areas
    (SMSA's), urbanized areas (UA's), American Indian reservations, and
    Alaska Native villages.  Selected tables contain housing characteristics
    for urban and rural areas.  These reports are issued separately for the
    United States, each State, the District of Columbia, Puerto Rico, Guam,
    Virgin Islands of the United States, American Samoa, Northern Mariana
    Islands, and the remainder of the Trust Territory of the Pacific Islands.

    HC80-1-B Detailed Housing Characteristics.  Some subjects included in
    the HC80-1-A reports are also shown in this report.  Additional subjects
    include units in structure, year householder moved into unit, year
    structure built, heating equipment, fuels, air conditioning, water and
    sewage, gross rent, and selected monthly ownership costs.  The
    statistics are shown for some or all of the following areas or their
    equivalents:  States, (including urban, rural nonfarm, and rural farm
    residence), counties places (and towns and townships in selected States)
    of 2,500 or more inhabitants, standard consolidated statistical areas
    (SCSA's), standard metropolitan statistical areas (SMSA's), urbanized
    areas (UA's), American Indian reservations, and Alaska Native villages.
    These reports are issued separately for the United States, each State,
    the District of Columbia, Puerto Rico, Guam, Virgin Islands of the
    United States, American Samoa, Northern Mariana Islands, and the
    remainder of the Trust Territory of the Pacific Islands.

    HC80-2 Metropolitan Housing Characteristics.  This volume presents
    statistics in considerable detail and cross-classification for most of
    the 1980 census housing subjects.  Most statistics are presented by race
    and Spanish origin for areas with at least a specified number of the
    relevant population groups.  Data are shown for States, standard
    metropolitan statistical areas (SMSA's) and their central cities, and
    other cities of 50,000 or more inhabitants.  There is one report for
    each SMSA, and one report for each State, The District of Columbia, and
    Puerto Rico.  The U.S. Summary shows these statistics for the United
    States and census regions.

    PHC80-1 Block Statistics.  (Microfiche report).  Data provided are
    derived from STF 1 and include final population and housing counts
    (totals) and statistics for selected characteristics based on responses
    to complete-count (100-percent) questions.  Data are shown for
    individual blocks in the blocked portion of each standard metropolitan
    statistical area (SMSA), and for urbanized areas (UA's), places of
    10,000 or more inhabitants, and areas that contracted with the Census
    Bureau to provide block statistics outside of SMSA's.  There is one
    title for each SMSA with block-numbered areas within the SMSA, one title
    for each State and Puerto Rico with block-numbered areas outside SMSA's,
    and a U.S. Summary that is an index to the set.  Block reports on
    micofiche and maps on paper stock are available from the U.S. Government
    Printing Office, Washington, D.C. 20402.  Microfiche paper prints of the
    reports are available from Data User Services Division, Customer
    Services (Microfiche), Bureau of the Census, Washington, D.C.   20233.

    PHC80-2 Census Tracts.  Data for selected population and housing
    subjects derived from STF 2 and STF 4 are shown by census tract for
    standard metropolitan statistical areas (SMSA's), central cities,
    component SMSA counties, selected non-SMSA counties, and places of
    10,000 or more inhabitants within SMSA's and selected counties.  Some
    tables are based on 100-percent or complete-count tabulations while
    others are based on sample tabulations.  There is one report for each
    SMSA and one for the tracted balance of most States and for Puerto
    Rico.  Tables showing tract comparability between 1970 and 1980 are
    included in this publication.  Maps are provided separately from the
    tract reports and are available from the U.S. Government Printing
    Office, Washington, D.C. 20402.  Until the publications are available
    (expected to become available beginning mid-1983 from GPO), photocopies
    of tables containing complete-count data may be purchased from Data User
    Services Division, Customer Services, Bureau of the Census, Washington,
    D.C.   20233.

    PHC80-3 Summary Characteristics for Governmental Units and Standard
    Metropolitan Statistical Areas.  This publication series is derived from
    STF 1 and STF 3 and shows selected population and housing statistics
    based on complete count and sample estimate data for States, counties,
    functioning minor civil divisions (20 specified States), and
    incorporated places.  There is one report for each State, the District
    of Columbia, and Puerto Rico.

    PHC80-4 Congressional Districts of the 98th Congress.  This report
    presents complete-count and sample data for congressional districts of
    the 98th Congress.  One report is available for each of the 50 States
    and the District of Columbia.
3Related Machine-Readable Files and Microfiche

    Listed below are some of the 1980 Census data files which have been or
    will be released.

    Census of Population and Housing, 1980:  Summary Tape Files (STF's).

    STF's 1 to 5 consist of multiple files, each file summarizing data for
    specific levels of geography.  The following discussion does not
    necessarily specify geographic levels features in each file, but
    provides only a general description of geographic areas covered in the
    whole STF.  Further information can be obtained from Data User Services
    Division, Customer Services, Bureau of the Census, Washington, D.C.
    20233.  Phone:  (301) 763-4100.

    STF 1 (Files A, B, C, D, E, F, and G) provides 321 cells of
    complete-count population and housing data.  This file set includes data
    shown in the PHC80-1, PHC80-3, and PC80-1-A reports.  Geographic areas
    for which data are summarized include the United States, regions,
    divisions, States, standard consolidated statistical areas (SCSA's),
    standard metropolitan statistical area (SMSA), and for urbanized areas
    (UA's), congressional districts, counties, county subdivisions, places,
    census tracts, enumeration districts in unblocked areas, and blocks and
    block groups in blocked areas.  STF 1 files A, B, C, have been
    released.  Data from the STF 1A and STF 1C files are also available on
    microfiche.  STF 1D contains data for congressional districts of the
    98th Congress.  This file has been released.  STF 1E for North Dakota
    provides data based on 1970 census geography.  This file has been
    released.  STF 1F presents data for school districts.  The files are
    being released by State on a flow basis.  STF 1G presents data for
    neighborhoods in areas that chose to participate in the Neighborhood
    Statistics Program.  Files are being released on a State-by-State basis.

    STF 2 (Files A, B, and C) contains 2,292 cells of detailed
    complete-count population and housing data, of which 962 are repeated
    for race and/or Spanish origin groups present in the tabulation area.
    Data are summarized for the United States census regions, census
    divisions, States, standard consolidated statistical areas (SCSA's),
    urbanized areas (UA's), counties, county subdivisions, places of 1,000
    or more inhabitants, census tracts, American Indian reservations, and
    Alaska Native villages.  This file set includes data shown in the
    PHC80-2, PC80-1-B, and HC80-1-A reports.  All STF 2 files have been
    released.

    STF 3 (Files A, B, C, D, F and G) contains 1,126 cells of population and
    housing data estimated from the sample.  This file set includes data
    shown in the sample tables of the PHC80-3 reports.  Files A and C
    provide data for the same areas as files A and C of STF 1, excluding
    blocks.  STF files 3A and 3C have been released.  These files are also
    available on microfiche.  File 3B, a special tabulation contracted for
    by a private organization, provides summaries for each 5-digit ZIP code
    area within States, standard metropolitan statistical areas (SMSA's),
    and counties.  STF files 3D, 3F, and 3G provide data for the same
    geographic areas as the corresponding STF 1 files.  Most State STF 3D
    files are available.  STF 3F and STF 3G files are being released on a
    State-by-State basis.

    STF 4 (Files A, B, and C) is the geographic counterpart of STF 2 and
    contains approximately 8,500 cells of population and housing data, of
    which approximately 3,500 are repeated for up to 39 race, Spanish
    origin, and ancestry groups present in the tabulation area.  Data are
    summarized for areas similar to those shown for STF 2, except that data
    for places are limited to those with 2,500 or more inhabitants.  This
    file set includes data shown in the PHC80-2, PHC80-1C, and HC80-1-B
    reports.  STF 4A and B files are being released on a State-by-State
    basis.

    STF 5 (Files A and C) contains over 100,000 cells of population and
    housing data estimated from the sample and provides highly detailed
    tabulations for States, standard metropolitan statistical areas
    (SMSA's), and counties and places of 50,000 or more inhabitants.  Most
    subjects are cross-classified by five race and Spanish origin groups.
    This file set includes data shown in the PC80-1-D and HC80-2 reports.
    STF 5 is scheduled to be available in late 1983.

    Census of Population and Housing, 1980:  Geographic Identification Code
    Scheme.  The file lists names and numeric codes for States, counties,
    county subdivisions (MCD's/CCD's), and places for which 1980 census data
    were tabulated.  It includes much of the information from the PHC80-R5
    Geographic Identification Code Scheme report.

    Census of Population and Housing, 1980:  Equal Employment Opportunity
    (EEO) Special File.  The file contains two tables.  Table 1 provides
    detailed occupation (514 categories) by sex.  Table 2 contains years of
    school completed by age and sex.  The data in both tables are
    cross-classification by sex and Hispanic origin or race for
    non-Hispanics.  These data are provided for States, the District of
    Columbia, standard metropolitan statistical areas (SMSA's), counties,
    and places with a population of 50,000 or more.

    Census of Population and Housing, 1980:  Public-Use Microdata Samples.
    Public-use microdata samples are computerized files containing records
    for a sample of housing units, with information on the characteristics
    of each unit and the persons in it.  These files do not contain names or
    addresses, and geographic identification is sufficiently broad to
    protect confidentiality.  There are three mutually exclusive samples
    (each released by State, groups of States, or for the U.S.):  the A
    sample including 5 percent, and the B and C samples each including 1
    percent of all persons and housing units.  Three 1-in-1,000 samples were
    also prepared, one each extracted from the A, B, and C samples.  Each
    sample features a different geographic scheme.  The A sample focuses on
    States, the B on SMSA's, and the C samples gives urban/rural components
    for regions and divisions and identifies UA's.  Separate sets of county
    groups are featured on the A and B samples.  Microdata files allow the
    user to prepare customized tabulations.  All state files have been
    released.

    Census of Population and Housing, 1980:  P.L. 94-171 Population Counts.
    The file, organized by State, provides count for total population, and
    provisional counts for five racial categories and Spanish/Hispanic
    origin.  Summaries are provided for the State, counties, minor civil
    divisions (MCD's) or census county divisions (CCD's), incorporated
    places or place segments within MCD's/CCD's, remainder of MCD's/CCD's,
    election precincts in certain States or portions of certain States,
    census tracts or block numbering areas, block groups and blocks or, for
    areas that are not block numbered, enumeration districts (ED's).  The
    figures presented in P.L. 94-171 may differ from those shown in STF 1.
    The changes reflect corrections of errors found after P.L. 94-171 was
    prepared.  Microfiche (and paper photo copy of microfiche) of the P.L.
    94-171 Population Counts file is also available.

    Census Software Package (CENSPAC).  CENSPAC is a generalized data
    retrieval system developed by the Census Bureau for use with Census
    Bureau statistical data files.  CENSPAC provides file processing
    capabilities primarily for summary data files, but also provides some
    features which apply to microdata files.  A manual describing the
    software accompanies each file order ($140 from Customer Services
    (Tapes) or may be purchased separately from Customer Services for $5.00.
Relevant Articles and Publications

 The following is a list of reference materials which provide additional
 information concerning the 1980 census.

 PHC80-R1 1980 Census of Population and Housing Users' Guide.  This
 publication is a comprehensive guide to 1980 census data.  It covers 1980
 census subject content, procedures, geography, statistical products,
 limitations of the data, sources of user assistance, notes on data use, a
 glossary of terms, and guides for locating data in reportsand tape files.
 The guide is issued in loose-leaf form and sold in parts (R1-A, -B, etc.) as
 they are prepared.  Part A, Text and Part B, Glossary (published as part of
 Supplement 1 to the Users' Guide) are available from the Superintendent of
 Documents, U.S. Government Printing Office, Washington, D.C.  20402.  Part
 A:  S/N 003-024-03625-8.  Price is $5.50.  Supplement 1 (including Part B):
 S/N 003-024-05004-8.  Price is $6.

 Census '80:  Continuing the Factfinder Tradition.  This publication,
 originally prepared for college classes, examined the history, organization,
 products, services, and uses of the 1980 census and is available from the
 Superintendent of Documents, U.S. Government Printing Office, Washington,
 D.C.  20402.  S/N 003-024-02262-1.  Price is $7.50.

 Factfinder for the Nation.  These brochures describe the range of census
 materials available on specific subjects.  Nos. 6 (Housing Statistics), 7
 (Population Statistics), 8 (Census Geography), and 22 (Data for Small
 Communities) discuss topics relevant to the 1980 census.  Limited free
 copies are available from Data User Services Division, Census History Staff,
 Bureau of the Census, Washington, D.C.  20233.

 Data User News.  This monthly newsletter provides continuous reporting on
 Census Bureau programs and products.  A subscription is available for $20 a
 year from the Superintendent of Documents, U.S. Government Printing Office,
 Washington, D.C.  20402.

 Monthly Product Announcement.  This free announcement lists new products
 released each month from the Census Bureau.  These products include
 publications, technical documentation, data files, published maps, and
 microfiche.  To be added to the mailing list, contact Data User Services
 Division, Customer Services (Publications), Bureau of the Census,
 Washington, D.C.  20233.
File Availability

    MARF 2 is available on a State-by-State basis.  Individual States may be
    purchased separately from Data User Services Division using the Customer
    Services order form for tapes.  A consolidated U.S. file will also be
    prepared.  The tapes are available at 1600 bpi or 6250 bpi, 9-track, at
    a cost of $140 per reel.  If data for more than one State are ordered and
    can be accommodated on a single reel, the cost is $165 per reel.  For
    information on the number of reels and release date for each State,
    subscribe to the Monthly Product Announcement (MPA).
File Structure and Geographic Coverage

 For each geographic area presented on MARF, there is a 390-character census
 logical record.  Each record begins with 252 characters of geographic
 information and suppression indicators.  For a concise description of the
 geographic coverage of MARF 2 see Appendix A.

 Figure 1 presents an overview of the sequencing of records in MARF.
 Although variations such as places split by minor civil divisions (MCD's),
 MCD's which both have block numbering areas (BNA's) and unblocked areas, and
 census tracts with both block groups (BC's) and enumeration distrits (ED's)
 are not shown, these variations are explained in the following discussion of
 each summary level record type appearing in MARF.

 The State record (Summary Level 04) contains a summary for the State or
 State equivalent.

 The county record (Summary Level 11) contains a summary for each county or
 county equivalent, including independent cities, within the State in FIPS
 code sequence.

 The minor civil division (MCD) / census county division (CCD) record
 (Summary Level 12) contains a summary for each MCD/CCD within the county in
 census code sequence.

 The place or remainder-of-MCD/CCD record (Summary Level 13) provides a
 summary for each place within the MCD/CCD in census place code sequence.

 These may be places or, when places cross MCD/CCD boundaries, portions of
 places.  A remainder-of-MCD/CCD record will be generated only if there is a
 place in the MCD/CCD.  This record will cover all areas outside of places
 and will have a pseudo place code of 9999.
Figure 1

                             FIGURE 1

                                                                      Summary
 Geography                                                              Level

 State 1............................................................. ....04
  County 1........................................................... ...11
    MCD/CCD 1........................................................ ...12
      Place 1........................................................ ...13
        Tract 1..........................................................14
          Block Group 1..................................................15
            Block Group 2
            '
            '
          Block Group N
        Tract 2..........................................................14
          Block Group 1..................................................15
          '
          '
          Block Group N
        Tract 3..........................................................14
        '
        '
        Tract N
      Place 2........................................................ ...13
        Tract 1..........................................................14
          ED 1....................................................... ...16
          '
          '
          ED N
        Tract 2..........................................................14
        '
        '
        Tract N
      Place 3........................................................ ...13
      '
      '
      Place N
    MCD/CCD 2........................................................ ...12
      Place 1........................................................ ...13
        Tract 1..........................................................14
          BG 1....................................................... ...15
          BG 2
          '
          '
          BG N
        Tract 2..........................................................14
        '
        '
        Tract N
      Place 2........................................................ ...13
      '
      '
      Place N
      Remainder of MCD/CCD 2.............................................13
    MCD/CCD 3........................................................ ...12
    '
    '
    MCD/CCD N
  County 2........................................................... ...11
    MCD/CCD 1........................................................ ...12
      Place 1........................................................ ...13
        Tract 1..........................................................14
          BG 1....................................................... ...15
          '
          '
          BG N
        Tract 2..........................................................14
        '
        '
        Tract N
      Place 2........................................................ ...13
      '
      '
      Place N
      Remainder of MCD/CCD 1.............................................13
    MCD/CCD 2........................................................ ...12
    '

    MCD/CCD N
  County 3........................................................... ...11
  '
  '
  County N
Figure 2

 The remaining summary levels on the MARF--tract block numbering area (BNA)
 (Summary Level 14) and block group (BG) (Summary Level 15) or enumeration
 district (ED) (Summary Level 16)--appear in one of six sequences depending
 on the geographic breakdown of a given area.  Figure 2 illustrates the six
 possible sequences.

                                   Figure 2

    A.  Tract                          D.  Block Numbering Area (BNA)
         Block Group (BG)                   Block Group (BG)

    B.  Tract                          E.  Pseudo BNA
                                            Enumeration District (ED)
         Block Group (BG)
         Enumeration District (ED)

    C.  Tract                          F.  Enumeration District (ED)
         Enumeration District (ED)

 A.  Tract/BG.  When an area is tracted and block-numbered, a summary is
     shown for each tract or tract portion within the MCD/CCD/place or
     remainder of MCD/CCD.  Each tract summary is followed by a summary for
     each BG within the tract or tract portion.  Tract summaries are in tract
     code sequence, and BG summaries are sequenced by the BG number.

 B.  Tract/BG/ED.  When a MCD/CCD is tracted and partially block-numbered,
     there will be both BG and ED summaries for the tract or tract portion
     within the MCD/CCD/place or remainder of MCD/CCD.  BG summaries will
     precede those for ED's.  BG summaries are sequenced by BG numbers, and
     ED summaries are sequenced by ED number and suffix.

 C.  Tract/ED.  When an area is tracted but not block-numbered, a summary is
     shown for each tract or tract portion within the MCD/CCD/place or
     remainder.  Each tract summary is followed by the summary for each ED
     within the tract or BNA portion.

 D.  BNA/BG.  When an area is not tracted but is block-numbered, there will
     be a summary for each BNA portion within the MCD/CCD/place or remainder,
     followed by a summary for each BG within the BNA or BNA portion.

 E.  Pseudo BNA/ED.  When the remainder of an untracted MCD/CCD is partially
     blocked, the blocked portion will be shown as in D above and the
     unblocked portion will be shown by a pseudo BNA (999999) followed by the
     summary for each ED in the area.

 F.  ED.  When an area is neither tracted nor block-numbered, a summary is
     shown for each ED within the place, place segment, or MCD/CCD.  ED records
     for the portion of MCD's/CCD's not covered by places will follow the
     remainder of MCD/CCD summary record, if applicable.
DESCRIPTION OF POPULATION

 Universe description =  All persons and housing units in the United States.
SUPPRESSION
Introduction
 To maintain the confidentiality promised respondents and required by law,
 the Census Bureau takes precautions to make sure that its public data, in
 print or on tape, do not disclose information about particular individuals
 or housing units; therefore the Bureau suppresses tabulations of
 characteristics for very small groups of people or housing units.  On
 summary tapes, zeroes are entered in suppressed cells.  However, a zero in a
 cell does not automatically mean suppression.  Only by checking the
 suppression flag field can it be determined if the zero in a specific item
 is suppressed data or an actual count of zero.

 The following discussion outlines the rules for suppression of
 complete-count and sample data as it applies to the subject items on MARF2.
No Suppression

 No Suppression

 The following counts are never suppressed:

                    Total population
                    Total housing units
                    Occupied housing units
                    Count of persons and households in each race and
                      Spanish origin group
Primary Suppression

 Primary Suppression

 Suppression of Population Characteristics.  Characteristics of persons other
 than race or Spanish origin are shown only if the number of persons in a
 geographic area meets minimum requirements.  For tabulations based on
 complete-count data (e.g., number of persons in group quarters), there must
 be 15 or more persons in the geographic area.  For tabulations based on
 sample estimates (e.g., per capita income), there must be 30 or more persons
 in the geographic area.

 Suppression of Family, Household, or Occupied Housing Characteristics.
 Characteristics of families, households, or occupied housing units are shown
 if there are five or more occupied housing units within the geographic area
 tabulated.

 Suppression of Owner or Renter Characteristics.  Distributions of data for
 owners or renters are shown when the number of owners is five or more and
 the number of renters is also five or more.

Programming with Suppression

 Suppressed data cells contain zeroes.  To distinguish between zeroes as
 suppression and zeroes as valid data, occurrences of suppression are
 identified by a series of flag fields in the geographic identification
 portion of each logical record.  Programmers developing software should
 include procedures to check these fields for the presence of suppression
 and, if necessary, to flag the output of any cumulation which includes one
 or more suppressed fields.

 In reviewing the data dictionary, the programmer can determine which
 suppression flags indicate suppression for particular items by checking
 either the item description or the flag description.
DATA DICTIONARY (RECORD LAYOUT)
How to Use the Data Dictionary (Record Layout)

 This computer-generated report documents the data contents and the record
 layout of the file.  Below is a brief description of the information
 provided for each data item.

 The first line of each data item description gives the name, size/scale,
 begin position, and the variable label.  Following those items, on
 subsequent lines, are any applicable notes and value codes.  Each of these
 items is defined below.

     1.  Name.  This is an arbitrarily assigned 8 character identifier.  It
         may be a mnemonic such as "STATE" or "EDNUMBER", or sequential
         identifiers such as "SUPFLO1", "SUPFLO2", etc.

     2.  Size/Scale.  The size of a data item is given in characters.  The
         scale of a data item is given in integer powers of 10.  Implied
         decimals or multipliers (in integer powers of ten only) are
         indicated by a "-" or a "+" followed by a number.  For example,
         123.45 would appear on the data tape as 12345, and the size/scale
         value would be 5/-2.  A number recorded in thousands (12,345,000 for
         example) would appear on the data tape as 12345 and the size/scale
         value would be 5/+3.  Scale factors which are not an integer power
         of ten are identified in the notes following the label, and in the
         footnotes.

     3.  Begin.  This is the location in the data record of the first
         character of the data item.

     4.  Data Type.  The type "A" indicates that the data item is represented
         by an alphabetic or numeric code; "N" indicates that an actual
         figure is provided.

     5.  Description.  Following the Data Type is a description of the data
         item.  This heading is not labeled on the data dictionary.  This
         section also provides any relevant notes or footnote references.  In
         addition, any value codes necessary for the data item are listed and
         labeled here.

 Note:  Since the standard geographic identification format for 1980 census
 summary tapes is used on the MARF 2 file, all geographic identifiers are
 included in the MARF 2 data dictionary.  However, the description indicates
 if the identifier is not applicable to MARF 2.
Data Dictionary (Record Layout), MARF2 Data
Part 1
                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------
 FILEID          5          1     A
                                    IDENTIFIER FOR SUMMARY FILE
                        MARF2       MASTER AREA REFERENCE FILE 2

 RECTYP          4          6     A
                                    IDENTIFIES MULTIPLE LOGICAL RECORD
                                    FORMATS ON STF FILES.
                                    IT IS BLANK IF ONLY ONE FORMAT IS PRESENT.
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 SUMRYLVL        2         10     A
                                    IDENTIFIES GEOGRAPHIC LEVEL OF CURRENT
                                    RECORD
                        01          UNITED STATES
                        02          REGION
                        03          DIVISION
                        04          STATE OR STATE EQUIVALENT
                        05          SCSA
                        06          SCSA/STATE
                        07          SMSA
                        08          SMSA/STATE
                        09          URBANIZED AREA
                        10          URBANIZED AREA/STATE
                        11          STATE/COUNTY OR COUNTY EQUIVALENT
                        12          STATE/COUNTY/MCD (CCD)
                        13          STATE/COUNTY/MCD (CCD)/PLACE
                        14          STATE/COUNTY/MCD (CCD)/PLACE/TRACT (BNA)
                        15          STATE/COUNTY/MCD (CCD)/PLACE/TRACT
                                    (BNA)/BG
                        16          STATE/COUNTY/MCD (CCD)/PLACE/TRACT
                                    (BNA)/ED
                        17          STATE/SMSA/COUNTY
                        18          STATE/SMSA/COUNTY/MCD (CCD)
                        19          STATE/SMSA/COUNTY/MCD (CCD)/PLACE
                        20          STATE/SMSA/COUNTY/MCD (CCD)/PLACE/TRACT
                                    (BNA)
                        21          STATE/SMSA/COUNTY/MCD (CCD)/PLACE/TRACT
                                    (BNA)/BLOCK
                        22          STATE/SMSA/COUNTY/MCD (CCD)/PLACE/TRACT
                                    (BNA)/ED
                        23          STATE/SMSA/COUNTY/PLACE
                        24          STATE/SMSA/COUNTY/PLACE/TRACT (BNA)
                        25          STATE/SMSA/COUNTY/PLACE/TRACT (BNA)/BLOCK
                        26          STATE/SMSA/COUNTY/PLACE/TRACT (BNA)/ED
                        27          STATE/PLACE
                        28          STATE/MCD SEQUENCE NUMBER
                        29          INDIAN RESERVATION (ANY)
                        30          INDIAN RESERVATION/STATE
                        31          INDIAN RESERVATION (ANY)/STATE/COUNTY
                        32          STATE/SMSA/COUNTY/TRACT (BNA)
                        33          STATE/CONGRESSIONAL DISTRICT (96th
                                    CONGRESS)
                        34          COUNTY/CCD (STF 1E, NORTH DAKOTA ONLY)
                        35          5-DIGIT ZIP CODE WITHIN STATE
                        36          5-DIGIT ZIP CODE STATE/SMSA/COUNTY
                        37          STATE/CONGRESSIONAL DISTRICT/COUNTY
                        38          STATE/CONGRESSIONAL DISTRICT/PLACE
                        39          STATE/CONGRESSIONAL DISTRICT/MCD
                        40          SCHOOL DISTRICT
                        41          SCHOOL DISTRICT/COUNTY
                        42          NEIGHBORHOOD PUBLICATION AREA
                        43          NEIGHBORHOOD

 URBARURL        2         12     A
                                    URBAN AND RURAL COMPONENT
                                    THIS INDICATOR IS APPLICABLE TO SUMMARY
                                    LEVELS 15 AND 16 ONLY.
                                    NOTE-  ONLY 01 and 08 ARE INDICATED ON
                                    MARF 2.
                        00          NOT URBAN AND RURAL COMPONENT
                        01          URBAN
                        02            INSIDE URBANIZED AREAS
                        03              CENTRAL CITIES
                        04              URBAN FRINGE
                        05            OUTSIDE URBANIZED AREAS
                        06              PLACES OF 10,000 OR MORE
                        07              PLACES OF 2,500 TO 10,000
                        08          RURAL
                        09            PLACES OF 1,000 TO 2,500
                        10            OTHER RURAL
                        11            FARM

 SMSACOM         2         14     A
                                    INSIDE AND OUTSIDE SMSA'S COMPONENT
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.
                        00          NOT INSIDE AND OUTSIDE SMSA COMPONENT
                        01          INSIDE SMSA'S
                        02            URBAN
                        03              CENTRAL CITIES
                        04              NOT IN CENTRAL CITIES
                        05            RURAL
                        06          OUTSIDE SMSA'S
                        07            URBAN
                        08            RURAL
Part 2

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 RACESPAN        2         16     A
                                    IDENTIFIES RACE/SPANISH ORIGIN GROUP
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 ANCESTRY        3         18     A
                                    IDENTIFIES SPECIFIC ANCESTRY GROUP
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 BLOCKPT         1         21     A
                                    BLOCKED PORTION INDICATOR
                                    A BLANK INDICATES NOT APPLICABLE OR THE
                                    TOTAL SUMMARY FOR A GEOGRAPHIC AREA WHICH
                                    IS PARTIALLY BLOCKED.
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

                        1           THIS SUMMARY IS FOR THE BLOCKED PORTION
                                    OF A GEOGRAPHIC AREA WHICH IS PARTIALLY
                                    BLOCKED OR A TOTAL SUMMARY FOR A
                                    GEOGRAPHIC AREA WHICH IS COMPLETELY
                                    BLOCKED.

 FSTATUS         1         22     A
                                    FUNCTIONAL STATUS CODE

                        A           ACTIVE GOVERNMENTAL UNIT RECOGNIZED FOR
                                    REVENUE SHARING, EXCEPT SEMI-INDEPENDENT
                                    PLACES, INDIAN RESERVATIONS, AND ALASKA
                                    NATIVE VILLAGES.
                        B           ACTIVE GOVERNMENTAL UNIT NOT RECOGNIZED
                                    FOR REVENUE SHARING.
                        C           SEMI-INDEPENDENCE PLACE
                        I           INACTIVE GOVERNMENTAL UNIT
                        N           NONFUNCTIONING GOVERNMENTAL UNIT
                        S           STATISTICAL ENTITY
                        F           FALSE ENTITY
                        R           INDIAN RESERVATION OR ALASKA NATIVE
                                    VILLAGE RECOGNIZED FOR REVENUE SHARING
                        Q           INDIAN RESERVATION OR ALASKA NATIVE
                                    VILLAGE NOT RECOGNIZED FOR REVENUE SHARING

 FLAG1           1         23     A
                                    SUBSTITUTION FLAG
                                    FIELD IS BLANK IF LESS THAN 20 PERCENT OF
                                    THE PERSONS OR YEAR-ROUND HOUSING UNITS
                                    WERE SUBSTITUTED.
                        1           20 PERCENT OR MORE OF THE PERSONS OR
                                    YEAR-ROUND HOUSING UNITS WERE SUBSTITUTED.

 PARTCOU         1         24     A
                                    COUNTY PART INDICATOR
                                    CODE IS APPLICABLE TO NEW ENGLAND
                                    SUMMARIES (SUMMARY LEVEL 11) ONLY.
                                    THE FIELD WILL BE BLANK IF THE COUNTY IS
                                    COMPLETELY INSIDE OR OUTSIDE ANY SMSA.
                        1           NEW ENGLAND COUNTY IS PARTIALLY INSIDE
                                    ONE OR MORE SMSA'S.

 FILLER1         6         25     A
                                    FILLER

 REGION          1         31     A
                                    REGION CODE
                        0           PUERTO RICO
                        1           NORTHEAST
                        2           NORTH CENTRAL
                        3           SOUTH
                        4           WEST

 DIVISION        1         32     A
                                    DIVISION CODE
                                    THE FIRST DIGIT OF THE GEOGRAPHIC STATE
                                    CODE.
                        0           PUERTO RICO
                        1           NEW ENGLAND
                        2           MIDDLE ATLANTIC
                        3           EAST NORTH CENTRAL
                        4           WEST NORTH CENTRAL
                        5           SOUTH ATLANTIC
                        6           EAST SOUTH CENTRAL
                        7           WEST SOUTH CENTRAL
                        8           MOUNTAIN
                        9           PACIFIC
Part 3

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 STATEGEO        2         32     A
                                    GEOGRAPHIC STATE CODE
                        63          ALABAMA
                        94          ALASKA
                        86          ARIZONA
                        71          ARKANSAS
                        93          CALIFORNIA
                        84          COLORADO
                        16          CONNECTICUT
                        51          DELAWARE
                        53          DISTRICT OF COLUMBIA
                        59          FLORIDA
                        58          GEORGIA
                        95          HAWAII
                        82          IDAHO
                        33          ILLINOIS
                        32          INDIANA
                        42          IOWA
                        47          KANSAS
                        61          KENTUCKY
                        72          LOUISIANA
                        11          MAINE
                        52          MARYLAND
                        14          MASSACHUSETTS
                        34          MICHIGAN
                        41          MINNESOTA
                        64          MISSISSIPPI
                        43          MISSOURI
                        81          MONTANA
                        46          NEBRASKA
                        88          NEVADA
                        12          NEW HAMPSHIRE
                        22          NEW JERSEY
                        85          NEW MEXICO
                        21          NEW YORK
                        56          NORTH CAROLINA
                        44          NORTH DAKOTA
                        31          OHIO
                        73          OKLAHOMA
                        92          OREGON
                        23          PENNSYLVANIA
                        15          RHODE ISLAND
                        57          SOUTH CAROLINA
                        45          SOUTH DAKOTA
                        62          TENNESSEE
                        74          TEXAS
                        87          UTAH
                        13          VERMONT
                        54          VIRGINIA
                        91          WASHINGTON
                        55          WEST VIRGINIA
                        35          WISCONSIN
                        83          WYOMING
                        06          PUERTO RICO

 STATE           2         34     A
                                    FIPS STATE CODE
                        01          ALABAMA
                        02          ALASKA
                        04          ARIZONA
                        05          ARKANSAS
                        06          CALIFORNIA
                        08          COLORADO
                        09          CONNECTICUT
                        10          DELAWARE
                        11          DISTRICT OF COLUMBIA
                        12          FLORIDA
                        13          GEORGIA
                        15          HAWAII
                        16          IDAHO
                        17          ILLINOIS
                        18          INDIANA
                        19          IOWA
                        20          KANSAS
                        21          KENTUCKY
                        22          LOUISIANA
                        23          MAINE
                        24          MARYLAND
                        25          MASSACHUSETTS
                        26          MICHIGAN
                        27          MINNESOTA
                        28          MISSISSIPPI
                        29          MISSOURI
                        30          MONTANA
                        31          NEBRASKA
                        32          NEVADA
                        33          NEW HAMPSHIRE
                        34          NEW JERSEY
                        35          NEW MEXICO
                        36          NEW YORK
                        37          NORTH CAROLINA
                        38          NORTH DAKOTA
                        39          OHIO
                        40          OKLAHOMA
                        41          OREGON
                        42          PENNSYLVANIA
                        44          RHODE ISLAND
                        45          SOUTH CAROLINA
                        46          SOUTH DAKOTA
                        47          TENNESSEE
                        48          TEXAS
                        49          UTAH
                        50          VERMONT
                        51          VIRGINIA
                        53          WASHINGTON
                        54          WEST VIRGINIA
                        55          WISCONSIN
                        56          WYOMING
                        72          PUERTO RICO
Part 4

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 SMSA            4         36     A
                                    FIPS STANDARD METROPOLITAN
                                    STATISTICAL AREA (SMSA) CODE

 COUNTY          3         40     A
                                    FIPS COUNTY CODE

 MCD             3         43     A
                                    MINOR CIVIL DIVISION/CENSUS
                                    COUNTY DIVISION (MCD/CCD) CODE

 PLACE           4         46     A
                                    CENSUS GEOGRAPHIC PLACE CODE
                                    9999 IN THIS FIELD INDICATES UNTRACTED
                                    BALANCE OF HIGHER LEVEL ENTITY OUTSIDE OF
                                    PLACE, E.G., REMAINDER OF MCD OR OF
                                    COUNTY.

 TRACT           6         50     A
                                    CENSUS TRACT OR BLOCK NUMBERING AREA (BNA)
                                    TRACT IS A FOUR-DIGIT BASIC CODE WITH
                                    IMPLIED DECIMAL AND TWO-DIGIT SUFFIX.
                                    999999 IN THIS FIELD INDICATES UNTRACTED
                                    REMAINDER OF A HIGHER LEVEL ENTITY, E.G.,
                                    REMAINDER OF MCD.

 TRACT4          4         50     A
                                    CENSUS TRACT OR BLOCK NUMBERING AREA (BNA)
                                    FOUR-DIGIT BASIC CODE.
                                    BNA SUMMARIES ARE NUMBERED BETWEEN 9901.
                                    AND 9989.

 TRACT2          2         54     A
                                    CENSUS TRACT OR BLOCK NUMBERING AREA (BNA)
                                    TWO-DIGIT SUFFIX CODE.
                                    BLANK IF NOT USED.

 BLKGRP          1         56     A
                                    BLOCK GROUP (BG)
                                    FIRST DIGIT OF BLOCK NUMBER

 BLOCK           3         56     A
                                    BLOCK
                                    NOTE-  NOT APPLICABLE TO MARF 2, EXCEPT
                                    AS NOTED DIRECTLY ABOVE.

 PARTPLAC        1         59     A
                                    PLACE/PART INDICATOR
                                    INDICATOR APPEARS ON RECORDS WHICH
                                    CONTAIN DATA FOR A PART OF A PLACE.
                        0           NEITHER PLACE NOR PLACE SEGMENT RECORD.
                        1           SPLIT
                        2           NOT SPLIT

 PARTTRCT        1         60     A
                                    TRACT/PART INDICATOR
                                    INDICATOR APPEARS ON RECORDS WHICH
                                    CONTAIN DATA FOR PART OF A TRACT OR BNA.
                        0           NOT A TRACT OR TRACT SEGMENT RECORD.
                        1           SPLIT
                        2           NOT SPLIT

 PARTBLK         1         61     A
                                    BLOCK/PART INDICATOR
                                    INDICATOR APPEARS ON RECORDS WHICH
                                    CONTAIN DATA FOR A PART OF A BLOCK.
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 EDINO           1         62     A
                                    ENUMERATION DISTRICT (ED)
                                    INDICATOR PREFIX
                                    FIELD IS BLANK IF ED IS NONE OF THOSE
                                    LISTED BELOW.
                                    A AND N ARE APPLICABLE
                                    TO SUMMARY LEVEL 15;
                                    M, P, S, AND V ARE APPLICABLE TO SUMMARY
                                    LEVEL 16.
                        A           HISTORIC AREAS OF OKLAHOMA (EXCLUDING
                                    URBANIZED AREAS); DISREGARD ALL OTHER
                                    AREAS.
                        M           MILITARY RESERVATION
                        N           AMERICAN INDIAN RESERVATION
                        P           NATIONAL OR STATE PARK OR FOREST LANDS
                        S           OTHER SPECIAL PLACE
                        V           CREWS OF VESSELS
Part 5

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 EDNUMBER        4         63     A
                                    ENUMERATION DISTRICT (ED)

 EDSUFFIX        1         67     A
                                    ENUMERATION DISTRICT SUFFIX IF
                                    APPLICABLE, CONTAINS AN ALPHABETIC
                                    CHARACTER A-Z.  OTHERWISE, SUFFIX WILL BE
                                    BLANK.

 SCSA            2         68     A
                                    FIPS STANDARD CONSOLIDATED STATISTICAL
                                    AREA (SCSA) CODE

 URBAREA         4         70     A
                                    URBANIZED AREA (UA) CODE

 CONDIST         2         74     A
                                    CONGRESSIONAL DISTRICT (CD) CODE
                        00          FOR DISTRICTS OF THE 96TH U.S. CONGRESS
                                    OUTLYING AREAS WHICH HAVE NO
                                    REPRESENTATIVES IN CONGRESS.
                        01          STATES HAVING ONE REPRESENTATIVE ("AT
                                    LARGE" STATES).
                        98          AREAS WITH A NON-VOTING DELEGATE IN
                                    CONGRESS.
                        99          AREAS SPLIT BY CONGRESSIONAL DISTRICT
                                    BOUNDARIES.

 INDANV          3         76     A
                                    INDIAN RESERVATION/ALASKA NATIVE VILLAGE
                                    (ANV) CODE

 MCDSEQNO        4         79     A
                                    MCD SEQUENCE NUMBER
                                    (AVAILABLE IN 11 STATES)
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 FILLER2         5         83     A
                                    FILLER

 WARD            2         88     A
                                    WARD
                                    AVAILABLE FOR APPROXIMATELY 190
                                    PARTICIPATING LOCAL AREAS.

 SEA             2         90     A
                                    STATE ECONOMIC AREA (SEA)
                                    FOR NONMETROPOLITAN SEA'S, A NUMERIC CODE
                                    UNIQUE WITHIN STATE IS ASSIGNED; FOR
                                    METROPOLITAN SEA'S, AN ALPHABETIC CODE
                                    UNIQUE WITHIN STATE IS ASSIGNED.

 ESR             3         92     A
                                    ECONOMIC SUBREGION (ESR)
                                    A GROUPING OF STATE ECONOMIC AREAS

 DOFFICE         4         95     A
                                    DISTRICT OFFICE
                                    CODE IS "9999"
                                    IF DATA FOR THIS SUMMARY WERE COLLECTED
                                    FROM MORE THAN ONE DISTRICT OFFICE.

 SEQID           4         99     A
                                    SEQUENCE IDENTIFIER
                                    FIRST TWO DIGITS (99-100)
                                    IDENTIFY THE SEQUENCE OF THIS RECORD
                                    SEGMENT AS A PART OF THE CENSUS LOGICAL
                                    RECORD.
                                    SECOND TWO DIGITS (101-102) IDENTIFY THE
                                    TOTAL NUMBER OF RECORD SEGMENTS FOR EACH
                                    CENSUS LOGICAL RECORD.
                                    NOTE-  NOT APPLICABLE TO MARF 2; FIELD IS
                                    BLANK.

 SMSASIZE        1        103     A
                                    STANDARD METROPOLITAN
                                    STATISTICAL AREA (SMSA)
                                    SIZE CODE
                                    ZERO OR BLANK IF NOT IN AN SMSA
                        1           UNDER 100,000
                        2           100,000-249,999
                        3           250,000-499,999
                        4           500,000-999,999
                        5           1,000,000-2,999,999
                        6           3,000,000-14,999,999
                        7           15,000,000 OR MORE
                        9           SPLIT BY SMSA BOUNDARY

 UATYPE          1        104     A
                                    URBANIZED AREA (UA) TYPE
                                    BLANK IF NOT IN A UA
                        0           AREA IN UA WHERE LARGEST CENTRAL CITY HAS
                                    LESS THAN 50,000 POPULATION.
                        1           AREA IN A UA WITH AT LEAST ONE CENTRAL
                                    CITY THAT HAS A POPULATION OF 50,000 OR
                                    MORE.
                        9           AREA IS SPLIT BY UA TYPE.

 UASIZE          1        105     A
                                    URBANIZED AREA (UA) SIZE
                                    ZERO OR BLANK IF NOT IN A UA
                        1           UNDER 100,000
                        2           100,000-249,999
                        3           250,000-499,999
                        4           500,000-999,999
                        5           1,000,000-2,999,999
                        6           3,000,000-14,999,999
                        7           15,000,000 OR MORE
                        9           SPLIT BY SMSA BOUNDARY

 PLACDESC        1        106     A
                                    PLACE DESCRIPTION
                        1           INCORPORATED CENTRAL CITY OF SMSA NOT UA
                        2           INCORPORATED CENTRAL CITY OF UA NOT SMSA
                        3           INCORPORATED CENTRAL CITY OF SMSA AND UA
                        4           OTHER INCORPORATED PLACE
                        9           NOT PLACE; PART OF MCD/CCD
                        A           CENSUS DESIGNATED PLACE, CENTRAL CITY OF
                                    UA NOT SMSA
                        B           CENSUS DESIGNATED PLACE, CENTRAL CITY OF
                                    SMSA AND UA
                        C           CENSUS DESIGNATED PLACE IN UA WITH
                                    CENTRAL CITY OF 50,000 OR MORE
                        E           CENSUS DESIGNATED PLACE COEXTENSIVE WITH
                                    MCD OR COUNTY
                        F           CENSUS DESIGNATED PLACE OF 1,000 OR MORE,
                                    NOT IN A UA OR CDP IN UA WITH CENTRAL
                                    CITY OF 50,000 OR LESS
                                    CENSUS DESIGNATED PLACE IN UA WITH
                                    CENTRAL CITY OF 50,000 OR LESS
                        G           CENSUS DESIGNATED PLACE IN HAWAII AND
                                    OUTLYING AREAS
                        H           CENSUS DESIGNATED PLACE IN ALASKA
                        I           ZONA URBANA IN PUERTO RICO

 PLACESZE        2        107     A
                                    PLACE SIZE
                        00          NOT IN A PLACE
                        01          UNDER 200
                        02          200-499
                        03          500-599
                        04          1,000-1,499
                        05          1,500-1,999
                        06          2,000-2,499
                        07          2,500-4,999
                        08          5,000-9,999
                        09          10,000-19,999
                        10          20,000-24,999
                        11          25,000-49,999
                        12          50,000-99,999
                        13          100,000-249,999
                        14          250,000-499,999
                        15          500,000-999,999
                        16          1,000,000 OR MORE

 XCITY           1        109     A
                                    EXTENDED CITY INDICATOR
                                    A BLANK INDICATES NOT APPLICABLE OR
                                    SUMMARY IS NOT A PLACE OR PART OF A PLACE
                                    WHICH IS PARTIALLY URBAN AND PARTIALLY
                                    RURAL.
                        X           SUMMARY IS FOR A PLACE OR PART OF A PLACE
                                    WHICH IS PARTIALLY URBAN AND PARTIALLY
                                    RURAL.

 CBD             1        110     A
                                    CENTRAL BUSINESS DISTRICT
                                    FIELD IS BLANK IF AREA IS NOT IN A
                                    CENTRAL BUSINESS DISTRICT
                        C           CENTRAL BUSINESS DISTRICT


 MCDCCDSZ        Z        111     A
                                    MINOR CIVIL DIVISION/CENSUS COUNTY
                                    DIVISION
                                    (MCD/CCD) SIZE
                        01          UNDER 200
                        02          200-499
                        03          500-599
                        04          1,000-1,499
                        05          1,500-1,999
                        06          2,000-2,499
                        07          2,500-4,999
                        08          5,000-9,999
                        09          10,000-19,999
                        10          20,000-24,999
                        11          25,000-49,999
                        12          50,000-99,999
                        13          100,000-249,999
                        14          250,000-499,999
                        15          500,000-999,999
                        16          1,000,000 OR MORE

 INDSUBR         3        113     A
                                    INDIAN SUBRESERVATION

 FIPSPLAC        5        116     A
                                    FIPS PLACE CODE
Part 6

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 SFAR            2        121     A
                                    STANDARD FEDERAL
                                    ADMINISTRATIVE REGION (SFAR)
                        01          CONNECTICUT
                                    MAINE
                                    MASSACHUSETTS
                                    NEW HAMPSHIRE
                                    RHODE ISLAND
                                    VERMONT
                        02          NEW JERSEY
                                    NEW YORK
                                    PUERTO RICO
                                    VIRGIN ISLANDS
                        03          DELAWARE
                                    DISTRICT OF COLUMBIA
                                    MARYLAND
                                    PENNSYLVANIA
                                    VIRGINIA
                                    WEST VIRGINIA
                        04          ALABAMA
                                    FLORIDA
                                    GEORGIA
                                    KENTUCKY
                                    MISSISSIPPI
                                    NORTH CAROLINA
                                    SOUTH CAROLINA
                                    TENNESSEE
                        05          ILLINOIS
                                    INDIANA
                                    MICHIGAN
                                    OHIO
                                    WISCONSIN
                        06          ARKANSAS
                                    LOUISIANA
                                    NEW MEXICO
                                    OKLAHOMA
                                    TEXAS
                        07          IOWA
                                    KANSAS
                                    MISSOURI
                                    NEBRASKA
                        08          COLORADO
                                    MONTANA
                                    NORTH DAKOTA
                                    SOUTH DAKOTA
                                    UTAH
                                    WYOMING
                        09          ARIZONA
                                    CALIFORNIA
                                    GUAM
                                    HAWAII
                                    NEVADA
                        10          ALASKA
                                    IDAHO
                                    OREGON
                                    WASHINGTON

 LONGITUD      7/-4       123     N
                                    LONGITUDE COORDINATE OF POPULATION
                                      CENTROID (TO 4 DECIMALS)
                                    NOTE-  TRACTS AND PLACES SPLIT BY HIGHER
                                    GEOGRAPHIC LEVELS HAVE A SEPARATE
                                    MEASUREMENT FOR EACH TRACT/PLACE PART.

                                    *CENTROID COORDINATES ARE NOT PROVIDED
                                    FOR THE TOTALS OF SPLIT TRACTS AND PLACES.
                                    DECIMAL POINT IS NOT SHOWN.

 LATITUDE      6/-4       130     N
                                    LATITUDE COORDINATE OF POPULATION
                                      CENTROID (TO 4 DECIMALS)
                                    NOTE-  TRACTS AND PLACES SPLIT BY HIGHER
                                    GEOGRAPHIC LEVELS HAVE A SEPARATE
                                    MEASUREMENT FOR EACH TRACT/PLACE PART.

                                    *CENTROID COORDINATES ARE NOT PROVIDED
                                    FOR THE TOTALS OF SPLIT TRACTS AND PLACES.
                                    DECIMAL POINT IS NOT SHOWN.

 LANDAREA      9/-2       136     N
                                    LAND AREA (SQUARE MILES TO THE NEAREST
                                    HUNDREDTH)
                                    NOTE-  LAND AREA IS PROVIDED FOR
                                    GEOGRAPHIC LEVELS DOWN TO PLACES OF 2,500
                                    INHABITANTS OR MORE AND MCD'S WITH A
                                    POPULATION OF 2,500 INHABITANTS OR MORE
                                    IN 11 SELECTED STATES.
                                    PLACES SPLIT BY HIGHER LEVELS OF
                                    GEOGRAPHY WILL NOT HAVE A SEPARATE
                                    MEASUREMENT FOR EACH PART; LAND AREA IS
                                    PROVIDED FOR THE TOTAL PLACE ONLY
                                    (SUMMARY LEVEL 27).
                                    DECIMAL POINT IS SHOWN.

 AREANAME      60         145     A
                                    AREA NAME
Part 7

                      RECORD 01

               SIZE/             DATA
   NAME        SCALE    BEGIN    TYPE
  ---------------------------------------------------------------------------

 SUPFLGO1      1          205     A
                                    TOTAL POPULATION
                                    SUPPRESSION FLAG
                                    A 1 IN THIS FIELD INDICATES SUPPRESSION
                                    BECAUSE THERE ARE 1-14 PERSONS IN THE
                                    GEOGRAPHIC AREA BEING SUMMARIZED.  IT
                                    WILL AFFECT THE FOLLOWING ITEM:
                                    NUMBER OF PERSONS IN GROUP QUARTERS
                                    (GROUPQ)
                        0           NO SUPPRESSION
                        1           SUPPRESSION

 FILLER3       8          206     A
                                    FILLER

 SUPFLGO2      1          214     A
                                    OCCUPIED HOUSING UNIT
                                    SUPPRESSION FLAG
                                    A 1 IN THIS FIELD INDICATES SUPPRESSION
                                    BECAUSE THERE ARE 1-4 OCCUPIED HOUSING
                                    UNITS IN THE GEOGRAPHIC AREA BEING
                                    SUMMARIZED.  THIS AFFECTS THE FOLLOWING
                                    ITEMS:
                                    NUMBER OF FAMILIES (FAMILIES)
                                    NUMBER OF ONE-PERSON HOUSEHOLDS (ONEPERHH)
                                    NUMBER OF OWNER-OCCUPIED HOUSING UNITS
                                    (OWNROCHU)
                        0           NO SUPPRESSION
                        1           SUPPRESSION

 FILLER4       25         215     A
                                    FILLER

 SUPFLGO3      1          240     A
                                    PER CAPITA INCOME
                                    SUPPRESSION FLAG
                                    A 1 IN THIS FIELD INDICATES SUPPRESSION
                                    BECAUSE THERE ARE 1-29 PERSONS IN THE
                                    GEOGRAPHIC AREA BEING SUMMARIZED.  IT
                                    WILL AFFECT THE FOLLOWING ITEM:
                                    PER CAPITA INCOME (PCI)
                        0           NO SUPPRESSION
                        1           SUPPRESSION

 PCI           12       241       N
                                    PER CAPITA INCOME
                                    (SAMPLE ESTIMATE)
                                    SUPPRESSION FLAG 03 APPLIES

                                    NEGATIVE NUMBERS MAY APPEAR IN THIS FIELD.
                                    CELLS WITH NEGATIVE INCOME WILL HAVE A
                                    "-" IN THE LEFTMOST POSITION, FOLLOWED BY
                                    LEADING ZEROS.

 TOTALPOP        9        253     N
                                    TOTAL POPULATION

 WHITE           9        262     N
                                    WHITE POPULATION

 BLACK           9        271     N
                                    BLACK POPULATION

 INDIAN          9        280     N
                                    AMERICAN INDIAN, ESKIMO, AND ALEUT
                                    POPULATION

 ASIANPI         9        289     N
                                    ASIAN AND PACIFIC ISLANDER POPULATION
                                    (SEE FOOTNOTE 1).

 OTHER           9        298       N
                                    OTHER RACES POPULATION
                                    (SEE FOOTNOTE 2).

 SPANISH         9        307     N
                                    PERSONS OF SPANISH ORIGIN POPULATION
                                    (SEE FOOTNOTE 3).

 FAMILIES        9        316     N
                                    NUMBER OF FAMILIES
                                    SUPPRESSION FLAG 02 APPLIES

 GROUPQ          9        325     N
                                    NUMBER OF PERSONS IN GROUP QUARTERS
                                    SUPPRESSION FLAG 01 APPLIES

 ONEPERHH        9        334     N
                                    NUMBER OF ONE PERSON HOUSEHOLDS
                                    SUPPRESSION FLAG 02 APPLIES

 HUNITS          9        343     N
                                    TOTAL NUMBER OF HOUSING UNITS

 OCHUNITS        9        352     N
                                    NUMBER OF OCCUPIED HOUSING UNITS

 OWNROCHU        9        361     N
                                    NUMBER OF OWNER OCCUPIED HOUSING UNITS
                                    SUPPRESSION FLAG 02 APPLIES

 SAMPLPOP        9        370     N
                                    TOTAL POPULATION
                                    (SAMPLE ESTIMATE)

 SAMPLEHU        9        379     N
                                    TOTAL NUMBER OF HOUSING UNITS
                                      (SAMPLE ESTIMATE)

 FILLER5         3        388
                                    FILLER

                                FOOTNOTE Section of Data Dictionary

               01       "ASIAN AND PACIFIC ISLANDER," IN THE 100-PERCENT
                           TABULATIONS, INCLUDES "JAPANESE," "CHINESE,"
                           "FILIPINO," "KOREAN," "ASIAN INDIAN,"
                           "VIETNAMESE," "HAWAIIAN," "GUAMANIAN," AND
                           "SAMOAN."
                           "ASIAN AND PACIFIC ISLANDER," IN SAMPLE
                           TABULATIONS, INCLUDES THE GROUPS LISTED ABOVE AND
                           THOSE PERSONS WHO HAVE A WRITE-IN ENTRY OF AN
                           ASIAN OR PACIFIC ISLANDER GROUP IN THE "OTHER"
                           CATEGORY.
               02       FOR DATA TABULATED ON A 100-PERCENT BASIS, INCLUDES
                           ALL PERSONS IN THE CATEGORY "OTHER."  FOR DATA
                           TABULATED FROM THE SAMPLE, EXCLUDES THOSE PERSONS
                           WHO HAVE A WRITE-IN ENTRY OF AN ASIAN OR PACIFIC
                           ISLANDER GROUP IN THE "OTHER" CATEGORY.
               03       PERSONS OF SPANISH ORIGIN MAY BE OF ANY RACE.
                           SPANISH ORIGIN INCLUDES MEXICAN, PUERTO RICAN,
                           CUBAN, AND OTHER SPANISH.
BUREAU OF CENSUS PRODUCT REVIEW
Summary Tape Files

 Computer-readable data from the 1980 census include both summary data and
 microdata.  Summary data include Summary Tape Files (STF's) 1 to 5, which
 are generally comparable to the First Count through Sixth Count files from
 the 1970 census.  In addition to the files in the STF series, other summary
 data released by the Bureau include a P.L. 94-171 Population Counts file
 used in reapportionment/redistricting, the Master Area Reference file which
 provides geographic items from STF 1 and selected population and housing
 items, and the Equal Employment Opportunity (EEO) Special File containing
 two tables, one on detailed occupation by sex and another on years of school
 completed by age and sex.  All of these files contain data summarized to
 various levels of geography.  Microdata files, on the other hand, contain
 disclosure-free household and person records from the census.  These are
 similar to the 1970 census public use sample files.

 Summary Tape Files vary by level of geography, detail of information, and
 whether they include 100-percent or sample data.  STF's 1 and 2 provide data
 based on the set of census questions asked of all persons and housing
 units.  STF's 3, 4, and 5 contain sample data or estimates based on the
 responses of a sample of population and housing units.  In 1980, the
 sampling rate was 1 in 2 in governmental units estimated to have less than
 2,500 inhabitants and 1 in 6 elsewhere.  Overall, the sampling rate was
 approximately 1 in 5.  The bureau's 1977 population estimates were used to
 determine the sampling rate for a given area.

 STF 1 provides the maximum possible geographic detail available from the
 census:  data for individual blocks in block-numbered areas and for
 enumeration districts outside block-numbered areas.  The lowest level of
 geography provided by STF 2 is the census tract, or minor civil
 division/census county division (MCD/CCD) and places of 1,000 or more
 inhabitants in nontracted areas.  The lowest level for STF 3 is the block
 group or enumeration district, while the smallest geographic unit for STF 4
 is the census tract, or MCD/CCD and places of 2,500 or more inhabitants in
 nontracted areas.  STF 5 contains summaries for States, standard
 metropolitan statistical areas (SMSA's), SMSA central cities, other places
 of 50,000 or more inhabitants, and counties of 50,000 or more inhabitants.

 STF's 1 to 5 each consist of multiple files, each file featuring specific
 levels of geography.  Figure 3 details the geographic levels on each STF.

 For comparison purposes, STF 1 is similar in subject matter and geographic
 detail to the First and Third Count files for 1970.  STF's 2 and 4 are
 roughly comparable to the 1970 Second and Fourth Counts, respectively.  STF
 3 is comparable to the 1970 Fifth Count, while STF 5 corresponds to the 1970
 Sixth Count.
Figure 3 (STF1-3)
                                   FIGURE 3

                       OVERVIEW OF PLANNED SUMMARY LEVELS
                       FOR 1980 CENSUS SUMMARY TAPE FILES

                                           STF 1         STF 2        STF 3
        SUMMAREA 1/ 2/                  100 Percent   100 Percent     Sample
                                       A B C D E F G    A  B  C    A B C D F G

 United States......................       *                  *        *
 Region.............................       *                  *        *
 Division...........................       *                  *        *
 State..............................   * * * * * *         *  *    *   * * *

 SCSA...............................       *                  *        *
 SCSA within State..................       *               *  *        *
 SMSA...............................       *                  *        *
 SMSA within State..................     * *            *  *  *        *

 Urbanized Area.....................       *                  *        *
 Urbanized Area within State........       *               *  *        *
 County within State................   *   *   *           *  *    *   * *
 MCD (CCD) within County
   within State.....................   *                   *       *

 ED or BG within Tract (BMA)
   within Place within MCD (CCD)
   within County within State.......   *                           *
 County within SMSA
   within State.....................     *              *
 ED or Block within Tract (BMA)
   within Tract (BMA) within
   Place within MCD (CCD) within
   County within SMSA within
   State............................     *

 Tract (BMA) within Place
   within County within SMSA
   within State.....................     *              *
 ED or Block within Tract (BMA)
   within Place within County
   within SMSA within State.........     *

 Place within State.................   *   *               *  *    *   *
 MCD (CCD) within State                    *                           *
 Indian Reservation and
   Alaskan Native Village...........                          *
 Indian Reservation and
   Alaskan Native Village
   within County within
   State............................                       *  *

 Tract within County
   within SMSA within State.........                    *
 Congressional Districts
   within State of the 97th
   Congress.........................   *   *                       *   *
 Congressional Districts
   within State of the 98th
   Congress.........................         *
 ZIP code (5-digit) within
   State............................                                 *
 ZIP code (5-digit) within
   County within SMSA within
   State............................                                 *

 County or Place or MCD within
   Congressional District within
   State............................         *                           *

 North Dakota CCD within County.....           *

 School District....................             *                         *
 County within School District......             *                         *

 Neighborhood Publication Area......               *                         *
 Neighborhood within
   Neighborhood Publication Area....               *                         *
Figure 3 (STF 4-5, Summary)


                       OVERVIEW OF PLANNED SUMMARY LEVELS
                       FOR 1980 CENSUS SUMMARY TAPE FILES

                                           STF 4         STF 5       Summary
        SUMMAREA 1/ 2/                     Sample        Sample       Level
                                          A   B   C      A    C      Codes 3/

 United States......................              *           *         01
 Region.............................              *           *         02
 Division...........................              *           *         03
 State..............................          *   *      *    *         04

 SCSA...............................              *           *         05
 SCSA within State..................          *   *                     06
 SMSA...............................              *           *         07
 SMSA within State..................      *   *   *      *              08

 Urbanized Area.....................              *                     09
 Urbanized Area within State........          *   *                     10
 County within State................          *   *      *              11
 MCD (CCD) within County
   within State.....................          *                         12

 ED or BG within Tract (BMA)
   within Place within MCD (CCD)                                    13, 14,
   within County within State.......                                15, & 16
 County within SMSA
   within State.....................      *                             17
 ED or Block within Tract (BMA)
   within Tract (BMA) within
   Place within MCD (CCD) within
   County within SMSA within                                        18,19,20,
   State............................                                21, & 22

 Tract (BMA) within Place
   within County within SMSA
   within State.....................      *                         23 & 24
 ED or Block within Tract (BMA)
   within Place within County
   within SMSA within State.........                                25 & 26

 Place within State.................          *   *      *              27
 MCD (CCD) within State.............                     *              28
 Indian Reservation and
   Alaskan Native Village...........              *                     29
 Indian Reservation and
   Alaskan Native Village
   within County within
   State............................      *   *                     30 & 31

 Tract within County
   within SMSA within State.........      *                             32
 Congressional Districts
   within State of the 97th
   Congress.........................$ 33
 Congressional Districts
   within State of the 98th
   Congress.........................                                    33
 ZIP code (5-digit) within
   State............................                                    35
 ZIP code (5-digit) within
   County within SMSA within
   State............................                                    36

 County or Place or MCD within
   Congressional District within
   State............................                                37,38 & 39

 North Dakota CCD within County.....                                    34

 School District....................                                    40
 County within School District......                                    41

 Neighborhood Publication Area......                                    42
 Neighborhood within
 Neighborhood Publication Area....                                      43
Footnotes to Figure 3

 1/  In addition to summary areas presented on the Summary Tape Files,
     geographic area codes are included for areas such as Ward, State
     Economic Area, District Office, Indian Subreservation, and Standard
     Federal Administrative Region.

 2/  Population size cutoffs for the presentation of Place level data in the
     STF's are as follows:

     STF 1A  all places                     STF 3A  all places
     STF 1B  all places                     STF 3B  All 5-digit zip code areas
     STF 1C  10,000 or more                 STF 3C  10,000 or more
     STF 1D  10,000 or more

     STF 2A  10,000 or more                 STF 4A  10,000 or more
     STF 2B   1,000 or more                 STF 4B   2,500 or more
     STF 2C  10,000 or more                 STF 4C  10,000 or more

                         STF 5  50,000 or more

 3/  Multiple summary level codes for a Summary Area indicate a series of
     very similar summary levels which are presented in identical STF files.
     A specific listing is shown below of summary levels which are grouped
     together from the chart.  (A slash mark "/" is used to indicate
     "within.")

     Grouping 13, 14, 15, and 16:
       13.  Place/MCD (CCD)/County/State
       14.  Tract (BNA)/Place/MCD (CCD)/County/State
       15.  BG/Tract (BNA)/Place/MCD (CCD)/County/State
       16.  ED/Tract/Place/MCD (CCD)/County/State

     Grouping 18, 19, 20, 21, and 22:
       18.  MCD (CCD)/County/SMSA/Stat
       19.  Place/MCD (CCD)/County/SMSA/State
       20.  Tract (BNA)/Place/MCD (CCD)/County/SMSA/State
       21.  Block/Tract (BNA)/Place/MCD (CCD)/County/SMSA/State
       22.  ED/Tract/Place/MCD (CCD)/County/SMSA/State

     Grouping 23 and 24:
       23.  Place/County/SMSA/State
       24.  Tract (BNA)/Place/County/SMSA/State

     Grouping 25 and 26:
       25.  Block/Tract (BNA)/Place/County/SMSA/State
       26.  ED/Tract/Place/County/SMSA/State

     Grouping 30 and 31:
       30.  Indian Reservations and Alaska Native villages by State
       31.  Indian Reservations by County within State

     Grouping 37, 38, and 39:
       37.  County/Congressional District/State
       38.  Place/Congressional District/State
       39.  MCD/Congressional District/State

 To summarize, STF's 1 and 2 contain complete-count data, while STF's 3, 4
 and 5 contain sample estimates.  STF 1 contains more detailed geography but
 less subject matter detail than STF 2.  Similarly, STF 3 contains more
 detailed geography but less subject matter detail than STF 4.  Finally, STF
 5 contains very detailed cross-tabulations of population and housing
 characteristics aggregated to a higher level of geography than the other
 files.
1980 CENSUS MAPS
Introduction

 Users may need certain types of maps for the geographic areas they are
 extracting from the files.  To determine which maps best define the
 different geographic areas, compare the geographic coverage of each file
 (see Appendix A) with the description of each type of 1980 census map (see
 below).

 There are five basic map types used in conjunction with the summary tape
 files:  county maps, place maps, place-and-vicinity maps, American Indian
 reservation maps, and Metropolitan Map Series (MMS) or Vicinity Map Series
 (VMS).  Ordering information for these maps may be obtained from Data User
 Services Division, Customer Services (Maps), Bureau of the Census,
 Washington, D.C.   20233.

 All five map types have several characteristics in common:

     --To improve legibility, most 1980 maps are at a larger scale than
         were the comparable 1970 maps.

     --Symbols used for the various boundaries are consistent for all
         five types of maps.

     --Names, identifying numbers, and boundaries are shown where
         appropriate on all maps for counties and equivalent entities, minor
         civil divisions (MCD's) or census county divisions (CCD's), places,
         American Indian reservations and Alaska Native villages, census
         tracts or block numbering areas (BNA's) where present, enumeration
         districts (ED's) (in those areas which are not block numbered), and
         blocks.

     --All maps show metric, feet, and mile scales.

     --All maps containing block-numbered areas are available from the
         U.S. Government Printing Office.

 The following paragraphs present a brief description of each type of census
 map.
County Maps
 County maps are the backbone of the Bureau's map coverage.
 Theoretically, with a complete set of these maps the overall picture of the
 census geographic framework for the entire United States and its possessions
 is shown.  Most maps in the county series are at a scale of 1 inch:1 mile.
 Most county maps are created by superimposing boundaries for most areas for
 which data are tabulated on base maps supplied by State transportation or
 highway departments.  There are approximately 5,500 county map sheets for
 1980.  The following geographic area boundaries are defined on county maps
 where appropriate:  State, county, minor civil divisions (MCD's) or census
 county divisions (CCD's), places, American Indian reservations, census
 tracts or block numbering areas (BNA's), and enumeration districts (ED's) or
 numbered blocks.  In addition, the locations of Alaska Native villages are
 indicated.  Counties which are totally covered by Metropolitan Map Sheets
 (MMS) do not have separate county maps.
Place Maps

 For places not covered on MMS or VMS sheets where most of the
 development is contained within the corporate limits of a municipality or
 within the boundaries established for a census designated place (CDP), the
 Bureau uses place maps.  The scale of the place maps varies from place to
 place.  As with the county maps, most are created by superimposing
 boundaries for most areas for which data are tabulated on base maps supplied
 by local or State governments.  On the county map, shading is added to
 indicate the area covered by the place map; i.e., the place map is regarded
 as an inset to the county map.  There are about 11,800 place map sheets for
 1980.  The geographic area boundaries defined on place maps are the same as
 for county maps.
Place-and-Vicinity Maps

 For places not covered on MMS or VMS sheets which
 have areas of development outside the corporate limits of a municipality or
 outside the boundaries established for a CDP, the Bureau uses
 place-and-vicinity maps.  Also included in this category are maps of places
 which have parcels of land that are not part of the city but are completely
 surrounded by the city and where two or more places appear on the same map
 sheet.  In all other respects, place-and-vicinity maps have the same
 characteristics as place maps.  As with the place maps, all area covered by
 the place-and-vicinity map is shaded on the county map and the
 place-and-vicinity map is considered to be an inset to the county map.
 There are about 4,500 place-and-vicinity map sheets for 1980.  The
 geographic area boundaries defined on these maps are the same as those
 specified for the county maps.
Indian Reservation Maps

 The Census Bureau developed separate maps for 20
 American Indian reservations which could not be depicted adequately on
 county Maps; these maps are similar in format to county maps.  There are
 approximately 100 American Indian reservation maps and these maps are
 special insets to the county maps.  The geographic area boundaries defined
 on these maps are the same as those specified for the county maps.
Metropolitan Map Series/Vicinity Map Series (MMS/VMS)

 For the Nation's major built-up areas, the Bureau has developed its own maps
 to provide uniform coverage of the densely settled portions of the counties
 involved. these maps are referred to as the Metropolitan Map Series (MMS)
 when the maps cover SMSA counties and as the Vicinity Map Series (VMS) when
 the maps cover areas which are not in an SMSA.  The predominant scale for the
 MMS and VMS is 1 inch:1,600 feet.  In selected areas with very dense
 development, some sheets are at 1 inch:800 feet; conversely, some sparsely
 settled areas are mapped at 1 inch:3,200 feet.  The MMS and VMS are
 considered to be insets to the county maps and the areas covered by MMS and
 VMS are shaded on county maps.  There are about 10,400 MMS and VMS sheets for
 1980.  (In a few instances, these map sheets entirely cover a county, in
 which case no separate county map exists.)  The geographic area boundaries
 defined on the MMS are the same as those specified for county maps, but also
 include urbanized areas.

 In addition to the five types of "outline" maps described above, there are a
 number of maps that are prepared and published as part of the various report
 series.  As was the case with the maps previously described, the maps
 included in the printed reports share common characteristics.  Both metric
 and mile scales are shown.  Map scale and content are similar to 1970 except
 where noted below; however, presentation has been improved to make the maps
 more readable and consistent from series to series.

 The County Subdivision Map Series consists of at least one map page for each
 State showing the names and boundaries for the State, each component county
 or equivalent entity, minor civil divisions (MCD's) or census county
 divisions (CCD's), and all places, both incorporated and census designated.
 For most States, the scale of the maps requires that they be presented in
 sections.  For 1980, the boundaries (not just the locations) of places with
 fewer than 2,500 inhabitants are shown for the first time.  In addition, the
 name(s) of adjoining State(s) are shown along with a mark to indicate where
 the State boundaries intersect.  These maps, which are based on the State
 base maps of the U.S. Geological Survey (USGS) National Mapping Program
 appear in PC80-1-A.  Single-sheet versions of the county subdivision map
 series are published at the USGS scale of 1:500,000 (1 inch equals about 8
 miles) for most States except Alaska and the outlying areas, and may be
 fitted together to form multi-State maps.  For those States in which
 American Indian reservations or Alaska Native villages are located, a
 special version of the county subdivision map showing these entities appears
 in PC80-1-B and HC80-1-A.

 The Urbanized Area Outline Map Series consists of one or more map sheets for
 each urbanized area (UA) defined on the basis of 1980 census results.  The
 names and boundaries of all States, counties, MCD's/CCD's, and places on
 each map are shown, plus the extent of territory defined as "urbanized."
 These maps appear in PC80-1-A and HC80-1-A.  In 1980, the report for each
 State containing part of a multi-State UA includes the map for the entire UA.

 The State SCSA/SMSA Map Series shows county names and boundaries, names and
 locations of all places with a population of 25,000 or more or designated as
 the central city of an SMSA, and names and boundaries of standard
 consolidated statistical areas (SCSA's) and standard metropolitan
 statistical areas (SMSA's) in the State.  For 1980, the name of the capital
 of the State is underlined.  These maps appear in PC80-1-A, B, C, D;
 HC80-1-A, B; and HC80-2.

 The Census Tract Outline Map Series covers each of the areas for which
 tracts have been defined in 1980.  These maps show the boundaries and code
 identification number for each tract; the names of streets or other features
 used as census tract boundaries; and the names and boundaries for counties,
 MCD/CCD's, and all places (not just those over 25,000 as in 1970).  Street
 detail within the tracts is not shown.  Separate insets of larger scale than
 the base maps are included for densely developed areas; however, fewer
 insets are used than in 1970.  Scale varies from map to map.  For 1980,
 tract outline maps were prepared for tracted counties outside SMSA's.  These
 maps are published in PHC80-2 Census Tracts (Maps) and should appear
 slightly ahead of the printed reports, PHC80-2 Census Tracts.

 Map sets were printed for all block-numbered areas, grouped by SMSA and the
 nonSMSA remainder of each State.  In addition to printed copies of the
 county, place, place-and-vicinity, and Metropolitan Map Series/Vicinity Map
 Series (MMS/VMS) sheets having block-numbered areas, there is an index map
 depicting the extent of the block-numbered area for the SMSA and State.  The
 SMSA Index to Block-Numbered Areas Maps show the extent of the SMSA; county,
 MCD/CCD, and place names and boundaries; and the extent of block-numbered
 area within the SMSA shown by means of shading.  The State Index to
 Block-Numbered Areas Maps were prepared by superimposing the extent of all
 block-numbered areas in the State over the county subdivision map.  This
 index map also shows the boundaries of the SMSA(s) in the State so that the
 reader can determine whether the data for any block-numbered area in the
 State are available with the SMSA tabulations or the remainder-of-State
 tabulations.
SAMPLING AN NONSAMPLING ERRORS

 Certain numbers in this file (per capita income, estimates of total persons
 and housing units) are based on a sample of questionnaire responses.  These
 data are estimates of the actual figures that would have resulted from a
 complete count and can be expected to vary from the complete-count result.
 These estimates contain some amount of chance error and are subject to
 sampling variability as well as nonsampling error.  A detailed discussion of
 the 1980 census sample design and of the sample variability of these
 estimates may be found in Appendix D of any PC80-1-C report, General Social
 and Economic Characteristics of the Population.  In general, sample
 estimates of total population and housing units will differ from the
 corresponding complete census counts for geographic areas not composed of
 entire counties.  When summed to the county level, however, these counts
 should agree.

 The remaining 1980 census population and housing counts shown in this file
 were tabulated from the entries for persons on all questionnaires, these
 counts are not subject to sampling error.  However, in any large-scale
 statistical operation such as a decennial census, human and mechanical
 errors do occur.  These errors are commonly referred to as nonsampling
 errors.  Such errors include failure to include every household or person in
 the universe, not obtaining all required information from respondents,
 obtaining incorrect or inconsistent information, and recording information
 incorrectly.  Errors can also occur during the field review of the
 enumerators' work, the clerical handling of the census questionnaires, or
 the electronic processing of the questionnaires.

 In an attempt to reduce various types of nonsampling errors in the 1980
 census, a number of techniques were introduced on the basis of experience in
 previous censuses and in tests conducted prior to the census.  These quality
 control and review measures were utilized throughout the data collection and
 processing phases of the census to reduce undercoverage of the population
 and housing units and to keep the errors at a minimum.  As was done after
 the 1950, 1960, and 1970 censuses, there were programs at the conclusion of
 the 1980 census to measure various aspects of the quality achieved in the
 census.  Reports on many aspects of the 1980 census evaluation program will
 be published as soon as the appropriate data are accumulated and analyzed.

 A major component of the evaluation work is to ascertain, insofar as
 possible, the degree of completeness of the count of persons and housing
 units.  The Census Bureau has estimated that the 1970 census did not count
 2.5 percent of the population.  For 1980, the Census Bureau's extensive
 evaluation program encompassed a number of different approaches to the task
 of estimating the coverage of the census.  Although these studies have not
 been completed, at the time of this file's release, preliminary estimates
 indicate that the rate of undercoverage in the 1980 census was reduced from
 1970 census levels.
EDITING AND ALLOCATION OF DATA ITEMS

 The objective of the census processing operation is to produce a set of
 statistics that describes the population as accurately and clearly as
 possible.  To meet this objective, certain unacceptable entries and blank
 items were edited.

 Editing.  In the field, questionnaires were reviewed for omissions and
 certain inconsistencies by a census clerk or an enumerator and, if
 necessary, a followup was made for missing information.  In addition, a
 similar review of questionnaires was done in the central processing
 offices.  As a rule, however, editing was performed by hand only when it
 could not be done effectively by machine.

 As one of the first steps in computerized editing, the configuration of
 marks on the questionnaire column was scanned electronically to determine
 whether it contained information for a person or merely spurious marks.  If
 the column contained entries for at least two of the basic characteristics
 (relationship, sex, race, age, marital status, Spanish origin), the
 inference was made that the marks represented a person.  In cases in which
 two or more basic characteristics were available for only a portion of the
 people in the unit, other information on the questionnaire provided by an
 enumerator was used to determine the total number of persons.  Names were
 not used as a criterion of the presence of a person because the electronic
 scanning was unable to distinguish an entry in the name space.

 Allocation.  Allocations, or assignments of acceptable codes in place of
 unacceptable entries, are needed most often when an entry for a given item
 is lacking or when the information reported for a person or housing unit on
 that item is inconsistent with other information for the person or housing
 unit.  The usefulness of the data is considered to be enhanced through the
 assignment of acceptable codes in place of blanks or unacceptable entries.

 For housing data, the assignment is based on related information reported
 for the housing unit or on information reported for a similar unit in the
 immediate neighborhood.  For example, if tenure for an occupied unit is
 omitted but a rental amount is reported for that unit, the computer edits
 tenure to "rented for cash rent."  On the other hand, if the unit is
 reported as rented but the amount of rent is missing, the computer assigns
 the rent from the preceding renter-occupied unit that had a rental amount
 reported.

 The general procedure for changing unacceptable population entries is to
 assign an entry for a person that is consistent with entries for other
 persons with similar characteristics.  Thus, a person who is reported as a
 20-year old son of the householder but for whom marital status is not
 reported, is assigned the same marital status as that of the last son
 processed in the same age group.  The allocation technique may be
 illustrated by the procedure used in the assignment for an unknown age.  The
 process is carried out in the following steps:

     1.  The computer stores reported ages of persons by selected
         characteristics, including sex, relationship, marital status, and
         characteristics of other household members.

     2.  Each stored age is retained in the computer only until a person
         having the same set of characteristics and with age reported is
         processed through the computer in the edit operation.  Then the age
         of this succeeding person is substituted for the age previously
         stored.

     3.  When a person processed has no report of age, or the entry is
         unacceptable, the age assigned to him or her is that which was
         stored for the last person who otherwise has the same set of
         characteristics.

 Substitution.  The editing process also includes another type of correction,
 namely the assignment of a full set of characteristics for a person or a
 housing unit.  The assignment of the full set of housing characteristics
 occurs when there is no housing information available.  If the housing unit
 is determined to be occupied, the housing characteristics are assigned from
 the previously processed occupied units.  If the housing unit is vacant, the
 housing characteristics are assigned from the previously processed vacant
 unit.

 The assignment of a full set of characteristics for a person in a household
 containing no information for all or most of the people, although persons
 were known to be present, is done in the following manner.  A previously
 processed household is selected as a substitute and the full set of
 population characteristics for each substituted person is duplicated.  These
 duplications fall into two classes:  (1) "persons substituted due to
 noninterview," e.g., a housing unit indicated as occupied but the occupants
 are not listed on the questionnaire, and (2) "persons substituted due to
 mechanical failure," e.g., where the questionnaire page on which persons are
 listed was not properly microfilmed.

 The editing process ensures that the distribution of characteristics for
 persons and housing units assigned by the computer corresponds closely to
 the distribution of characteristics for persons and housing units actually
 reported in the census.  Before the advent of the computer, this type of
 process was not feasible and the distribution of characteristics to be used
 for assignment purposes was drawn from the preceding census or another
 source.

 Specific tolerances are established for the number of computer allocations
 and substitutions that are permitted.  If the number of corrections is
 beyond tolerance, the questionnaires in which the errors occurred are
 clerically reviewed.  If it is found that the errors resulted from damaged
 questionnaires, from improper microfilming, from faulty reading by FOSDIC
 (Film Optical Sensing Device for Input to Computers) of undamaged
 questionnaires, or from other types of machine failure, the questionnaires
 are reprocessed.
GLOSSARY
Introduction
                              Concept Definitions

 The following definitions were taken from the 1980 Census of Population and
 Housing Users' Guide.  Since the items described here are only those which
 appear in MARF 2, there may be references to other terms which are not
 defined in this glossary.  A complete glossary is available in the Users'
 Guide.
A-B

 ALASKA NATIVE VILLAGES.  Alaska Native villages constitute tribes, bands,
 clans, groups, villages, communities, or associations in Alaska which were
 listed in sections 11 and 16 of the Alaska Native Claims Settlement Act,
 Public Law 92-203, or which met the requirements of the Act and which the
 Secretary of Interior determined were, on the 1970 census enumeration date
 (April 1), composed of 25 or more Alaska Natives.  This list was reviewed
 and updated for the Census Bureau by the State of Alaska prior to the 1980
 census, to specifically identify only those entities that were legally
 recognized as Alaska Native villages.

 Data summaries for Alaska Native villages are included in STF's 2B, 2C, 4B,
 and 4C, and reports PC80-1-B and -C and HC80-1-A and -B.  Population and
 housing counts for Alaska Native villages are scheduled to be included in a
 supplementary report (PC80-S1 series).  In addition, a population subject
 report (PC80-2 series), featuring additional data on Alaska Native villages
 is also planned.  Data for each Alaska Native village can be derived from
 MARF, MARF 2, STF 1A, and STF 3A by identifying the component ED(s), and
 summarizing the data should multiple ED's be involved.  (NOTE-  Eklutna
 Native Village is in a blocked area; therefore, data can be derived from
 block group (BG) summaries for the village.)  Each Alaska Native village has
 been assigned a unique 3-digit code by the Bureau which appears in the
 reservation code field.

 Alaska Native villages will be identified on the Alaska subdivision maps in
 the PC80-1-B and HC80-1-A reports.  Alaska Native villages are also shown on
 Metropolitan Map Series, place, and county maps.  It should be noted that
 Alaska Native villages do not have boundaries that are defined by legal
 descriptions, and therefore the boundaries shown on the census maps are only
 indicative of the approximate extent of a village; for those that correspond
 to a city or census designated place, the limits of such places are
 construed to coincide with the extent of the Alaska Native village.

 Historical comparability:  Data are not available from previous censuses for
 Alaska Native villages.  Some cities and "unincorporated places" (referred
 to as "census designated places" in 1980) which were identified in the 1970
 census may correspond to 1980 Alaska Native villages, but may not have
 identical boundaries.
                                    FIGURE 4


                           -------------------- MCD STATES -------------------
                                                                     (4)
                      (1)         (2)              (3)         DATA PUBLISHED
                      CCD      PRINCIPAL,    MCD'S MAY SPLIT      FOR MCD's,
    UNITED STATES    STATE    TYPE OF MCD       BLOCKS 1/     AS FOR PLACES 2/

 ALABAMA               X
 ALASKA 3/                  Census subarea
 ARIZONA               X
 ARKANSAS                   Township
 CALIFORNIA            X
 COLORADO              X
 CONNECTICUT                Town                    X                 X
 DELAWARE              X
 DIST. OF COLUMBIA          Quadrant
 FLORIDA               X
 GEORGIA               X
 HAWAII                X
 IDAHO                 X
 ILLINOIS                   Township                X
 INDIANA                    Township                X
 IOWA                       Township
 KANSAS                     Township                X
 KENTUCKY              X
 LOUISIANA                  Policy jury ward
 MAINE                      Town                    X                 X
 MARYLAND                   Election
                              district
 MASSACHUSETTS              Town                    X                 X
 MICHIGAN                   Township                X                 X
 MINNESOTA                  Township                X
 MISSISSIPPI                Superv.
                              district
 MISSOURI                   Township                X
 MONTANA               X
 NEBRASKA                   Township                X
 NEVADA                     Township
 NEW HAMPSHIRE              Town                    X                 X
 NEW JERSEY                 Township                X                 X
 NEW MEXICO            X
 NEW YORK                   Town                    X                 X
 NORTH CAROLINA             Township
 NORTH DAKOTA               Township                X
 OHIO                       Township                X
 OKLAHOMA              X
 OREGON                X
 PENNSYLVANIA               Township                X                 X
 RHODE ISLAND               Town                    X                 X
 SOUTH CAROLINA        X
 SOUTH DAKOTA               Township                X
 TENNESSEE             X
 TEXAS                 X
 UTAH                  X
 VERMONT                    Town                    X                 X
 VIRGINIA                   Magisterial
                              dist.
 WASHINGTON            X
 WEST VIRGINIA              Magisterial
                              dist.
 WISCONSIN                  Town                    X                 X
 WYOMING               X

 1/ See definitions for MCD's and blocks.
 2/ The amount of data for MCD's and places is the same, for the States
    noted, in these reports:  PC(1)-8 and -C and MC(1)-A and -B.
 3/ Subdivisions of Alaska's "census areas" or boroughs (county equivalents)
    are called "census subareas."  They take the place of MCD's or CCD's.

                                    FIGURE 4
                                  (CONTINUED)

                                         (5)                         (6)
                                   BLOCK STATISTICS             CENSUS TRACTS
    UNITED STATES                      STATEWIDE                  STATEWIDE

 ALABAMA
 ALASKA 3/
 ARIZONA
 ARKANSAS
 CALIFORNIA
 COLORADO
 CONNECTICUT                                                          X
 DELAWARE                                                             X
 DIST. OF COLUMBIA                        X                           X
 FLORIDA
 GEORGIA                                  X
 HAWAII                                                               X
 IDAHO
 ILLINOIS
 INDIANA
 IOWA
 KANSAS
 KENTUCKY
 LOUISIANA
 MAINE
 MARYLAND
 MASSACHUSETTS
 MICHIGAN
 MINNESOTA
 MISSISSIPPI                              X
 MISSOURI
 MONTANA
 NEBRASKA
 NEVADA
 NEW HAMPSHIRE
 NEW JERSEY                                                           X
 NEW MEXICO
 NEW YORK                                 X
 NORTH CAROLINA
 NORTH DAKOTA
 OHIO
 OKLAHOMA
 OREGON
 PENNSYLVANIA
 RHODE ISLAND                             X                           X
 SOUTH CAROLINA
 SOUTH DAKOTA
 TENNESSEE
 TEXAS
 UTAH
 VERMONT
 VIRGINIA                                 X
 WASHINGTON
 WEST VIRGINIA
 WISCONSIN
 WYOMING

 1/ See definitions for MCD's and blocks.
 2/ The amount of data for MCD's and places is the same, for the States
    noted, in these reports:  PC(1)-8 and -C and MC(1)-A and -B.
 3/ Subdivisions of Alaska's "census areas" or boroughs (county equivalents)
    are called "census subareas."  They take the place of MCD's or CCD's.

 ALEUT POPULATION.  See RACE.

 AMERICAN INDIAN POPULATION.  See RACE.

 AMERICAN INDIAN RESERVATIONS.  American Indian reservations are areas with
 boundaries established by treaty, statute, and/or executive or court order.
 The reservations and their boundaries were identified for the Census Bureau
 by the bureau of Indian Affairs (BIA) and State governments.  Federal and
 State reservations are located in 33 States and may cross State, county,
 minor civil division/census county division, and place boundaries.  In
 tabulations for reservations, tribal trust lands outside the boundaries of
 reservations (off-reservation) are not included as part of the reservations
 (see below).

 Preliminary evaluation of the 1980 census data suggest that counts for a few
 reservations may be subject to certain limitations or nonsampling errors.
 Although the various field and computer operations undergo a number of
 quality control checks to ensure accuracy of the data, available evidence
 indicates that nonsampling errors are substantial for a small number of
 reservations.  For example, a few reservations have a relatively high
 substitution rate.  A listing of reservations where characteristics for 20
 percent or more of the persons or housing units in the 1980 Census were
 substituted are shown in PC80-1-B reports, Appendix D, "Accuracy of the
 Data."  (For a fuller discussion of nonsampling errors, see the Users' Guide
 chapter 6, "Data Limitations," report appendixes on "Accuracy of the Data,"
 or the "Technical Information" section in tape technical documentation.)
 Additional evaluation of the 100-percent counts for reservations is being
 completed and a fuller explanation will be published in a 1980 census
 supplementary report, series PC80-S1, "Population and Housing Unit Counts
 for American Indian Areas and Alaska Native Villages:  1980."

 Each American Indian reservation was assigned a unique 3-digit code by the
 Bureau.  Enumeration districts (ED's) and block groups (BG's) which are
 inside boundaries of reservations are designated with an "N" in the ED
 prefix field in tape files.

 Data summaries for American Indian reservations are included in STF's 2B,
 2C, 4B, and 4C, and reports PC80-1-B and -C and HC80-1-A and -B.  Population
 and housing counts for reservations are scheduled to be included in a
 supplementary report (PC80-S1 series).  Also, a population subject report
 (PC80-2 series) presenting additional data on American Indian reservations
 is also planned.  Summaries on tape and in PC80-1-B and HC80-1-A show data
 not only for the reservation totals, but also for parts of reservations that
 cross State or county boundaries.  Reservation data can also be derived from
 MARF, MARF 2, STF 1A, and STF 3A by the addition of component ED or BG
 summaries.  Maps outlining reservation boundaries are included in the
 PC80-1-B and HC80-1-A reports.  Reservation boundaries are also shown on
 Metropolitan Map Series, place, and county maps.

 Historical comparability:  Data on 115 American Indian reservations were
 published in the 1970 census subject report, American Indians, PC(2)-1F.
 However, 1980 data may not be comparable to 1970 information because of
 boundary changes, improvements in geographic identification, new enumeration
 techniques, and other procedural changes made for the 1980 census.

 AMERICAN INDIAN SUBRESERVATION AREAS.  Entities known as "areas,"
 "chapters," "districts," "segments," or "communities" are associated with
 some American Indian reservations and were identified for the Census Bureau
 by tribal governments or the Bureau of Indian Affairs (BIA).  In a few
 cases, such subreservation areas extend beyond reservation boundaries or are
 located entirely outside the reservation (off-reservation.  American Indian
 subreservations recognized for the 1980 census are identified by a unique
 3-digit code.

 Data for subreservations are not summarized in regular census tabulations;
 however, subreservation data can be obtained from the Census Bureau on a
 cost-reimbursable basis from a special tabulation.  (For further information
 regarding subreservation areas, please write Population Division, Racial
 Statistics Branch, Bureau of the Census, Washington, D.C.  20233.)

 Historical comparability:  American Indian subreservation areas were not
 identified separately in previous censuses.

 AMERICAN INDIAN TRIBAL TRUST LANDS.  Some American Indian reservations have
 tribal trust lands in the vicinity of the reservation.  The Bureau of Indian
 Affairs identified these areas for the 1980 census.  Tribal trust lands are
 located outside the reservation boundary (off-reservation) and are
 associated with a specific reservation.

 Population and housing counts for tribal trust lands are scheduled to be
 included in a supplementary report (PC80-S1 series).  Additional information
 for these areas may be included in special reports or unpublished
 tabulations.  Also, such data can be obtained from the Census Bureau on a
 cost-reimbursable basis from a special tabulation.  (For further information
 regarding the geography for tribal trust lands, please write to Population
 Division, Racial Statistics Branch, Bureau of the Census, Washington, D.C.
 20233.)

 Historical comparability:  Tribal trust lands were not identified in
 previous censuses.

 AREA, LAND.  See LAND AREA.

 ASIAN AND PACIFIC ISLANDER POPULATION.  See RACE.

 BARRIO.  See PUERTO RICO AND OUTLYING AREAS.

 BLACK POPULATION.  See RACE.

 BLOCK.  Normally a rectangular piece of land, bounded by four streets.
 However, a block may also be irregular in shape or bounded by railroad
 tracks, streams, or other features.  Blocks do not cross the boundaries of
 counties, census tracts, or block numbering areas (BNA's).  They may cross
 place boundaries and the boundaries of minor civil divisions (MCD's).  When
 blocks cross place boundaries and, in 20 States (see figure 4, column 3)
 when they cross MCD boundaries, separate statistical summaries are presented
 for each part of the block.

 Census blocks are normally compact units, but there are important
 exceptions.  For example, in some suburbs, houses cluster around
 cul-de-sacs.  In these areas a census block may be fairly large since only
 those features that serve as the perimeter of an enclosed area are treated
 as block boundaries.  Also, in those rural areas where they are numbered,
 blocks may include many square miles, depending on the frequency of
 intersections of roads, rivers, mountain ridges, or other physical features.

 Census data are tabulated by block in all urbanized areas (UA's) and
 generally for some territory extending beyond the UA boundaries.  Data also
 are tabulated by block in incorporated places with 10,000 or more
 inhabitants outside UA's, and in other areas which contracted with the
 Census Bureau for the preparation of block statistics.  Places outside of
 UA's are included in the block statistics program if they met the 10,000
 population criterion in the 1970 census, in official Bureau estimates
 through 1976, or in a special census taken on or before December 31, 1977.
 Block coverage for qualifying places is within boundaries as of January 1,
 1980.  Five States contracted for the preparation of block statistics for
 all of their territory, both urban and rural, not already in the block
 statistics program. These States are Georgia, Mississippi, New York, Rhode
 Island, and Virginia.

 A block is identified by a 3-digit code which is unique within census tract
 or, where tracts do not exist, BNA.  Since separate summaries are provided
 for the parts of a block split by a place boundary or, in 20 States, an MCD
 boundary, tape users often will need to specify the place or MCD code, along
 with other codes, to retrieve data for a block.  Blocks are defined on
 detailed census maps:  Metropolitan Map Series (MMS), Vicinity Map Series
 (VMS), place maps, and county maps.  The extent of block statistics coverage
 is reflected on maps by the presence of the 3-digit block number and the
 absence of ED boundaries and numbers.

 On census maps, when a block boundary ignores a minor physical feature, such
 as a railroad track, a "fishhook" (   ) across the feature indicates that
 the block includes area on both sides of the feature.  Alternatively, the
 separate parts of such a block may have identical block numbers, each
 followed by an asterisk.

 The maps used for enumeration activities were, of necessity, obtained
 several years prior to the census and therefore do not reflect recently
 constructed streets.  Only those features shown on the maps can serve as
 block boundaries.

 Statistics were collected for approximately 2.6 million blocks in the 1980
 census.  Block statistics are included in PHC80-1 Block Statistics
 microfiche series and in file B of Summary Tape File 1 (STF 1B).

 Historical comparability:  In 1970 block statistics were prepared for UA's
 (and some territory beyond) located in SMSA's existing at the time of the
 census, as well for contract areas.  Unlike 1980, they were not prepared for
 places of 10,000 population or more outside UA's unless done under contract,
 nor for UA's in not-yet-defined SMSA's.

 Some blocks defined for 1970 will have new boundaries in 1980, primarily
 those on the edges of UA's and other areas of new development where the
 street patterns have changed.  To help the user notice a change wherever a
 block has been redefined by splitting or other adjustment, the 1970 block
 number will generally not be reused.  Where blocks were recognized for the
 1970 census, their boundaries and numbers generally will be the same in
 1980, except for a few areas where blocks were renumbered by local
 GBF/DIME-File coordinating agencies in order to define more desirable block
 groups.

 BLOCK GROUP (BG).  A combination of numbered census blocks that is a
 subdivision of a census tract or block numbering area (BNA) and is defined
 in all areas for which block statistics are prepared.  (In areas where
 blocks are not numbered, ED's are used instead of BG's.)

 BG's are not outlined on census maps, but are defined as that set of
 numbered blocks sharing the same first digit within a census tract or BNA.
 For example, Block Group "3" within a particular census tract would include
 any blocks numbered between 301 and 399.  In most cases, the numbering would
 generally involve substantially fewer than 50 blocks, since gaps are
 occasionally left in the numbering; e.g., Block 312 might be followed by
 Block 316.

 BG's are defined within census tract or BNA.  They may cross, and be split
 by, the boundaries of minor civil divisions (MCD's) or census county
 divisions (CCD's), places, congressional districts, urbanized areas, and
 Indian reservations.  When this occurs, statistical summaries (data records)
 are provided for each component or part.  To avoid mistaking a component
 summary for a complete BG summary, users should carefully study census maps
 to note any BG's split by place, MCD or CCD, urbanized area, and Indian
 reservation boundaries.  Congressional district (CD) boundaries are not
 shown on census maps, so the maps will not be of use in detecting BG's split
 by CD boundaries.

 BG summaries observe boundaries of some areas (specifically, CCD's and, in
 10 States, MCD's) which are ignored in summarizing data for the block
 statistics presentations in reports and on tape.  As a result, it will
 occasionally be necessary to add BG components together to match the sum of
 blocks in the same hundreds series.

 Statistics will be prepared for almost 200,000 BG's.  BG data, together with
 data for ED's, appear on STF's 1A and 3A, and in any corresponding
 microfiche.  There are no printed data for BG's.

 Historical comparability:  In areas where BG's were tabulated in 1970, many
 1980 BG's will be the same as their 1970 counterparts, with exceptions
 occurring primarily in areas where tract boundaries have changed or where
 substantial development has taken place.  Also, BG parts, created when BG's
 are split by the boundaries of higher level areas, will change if such
 boundaries have changed.

 Many areas with BG's in 1980 had data reported by ED's in 1970, a change
 occasioned in part by the expansion of the block statistics program, and in
 part because ED's were used for tabulation purposes in 1970 instead of BG's
 in some block numbered areas.  Where BG's have replaced ED's, there will be
 little comparability between 1970 ED's and 1980 BG's.

 BLOCK NUMBERING AREA (BNA).  An area defined for the purpose of grouping and
 numbering blocks in block-numbered areas where census tracts have not been
 defined--typically, in non-SMSA places of 10,000 or more population and in
 contract block areas.  BNA's do not cross county boundaries.  They are
 identified by census tract-type numbers ranging from 9901.00 to 9989.99
 which are unique within a county.  While BNA numbers are similar to census
 tract numbers, BNA's are not census tracts and are not included in STF's 2
 or 4.

 BNA's may be split by the boundaries of places, MCD's, and CCD's.
 Statistical summaries appear in STF 1B and PHC80-1 Block Statistics
 microfiche series for the component parts of BNA's created when BNA's are
 split by the boundaries of places and, in 20 States, MCD's.  (See figure 4,
 column 3.)  Such component summaries appear in STF 1A and 3A when BNA's are
 split by the boundaries of CCD's in 20 States (see figure 4, column 1) and
 MCD's in 10 other States and Puerto Rico.

 Historical comparability:  While BNA's were also used in previous censuses,
 any historical comparability is generally coincidental.

 BOROUGH (IN ALASKA).  See COUNTY.
C-G

 CENSUS AREA (IN ALASKA).  See COUNTY.

 CENSUS COUNTY DIVISION (CCD).  A statistical subdivision of a county,
 roughly comparable to a minor civil division (MCD).  CCD's are defined in 20
 States (see figure 4, column 1) which do not have MCD's suitable for
 reporting census statistics (i.e., the MCD's have either lost their original
 significance, are very small in population, have frequent boundary changes,
 and/or have indefinite boundaries).  CCD's are established cooperatively by
 the Census Bureau and both State and local government authorities.  They are
 generally defined by boundary features that seldom change and can be easily
 located, such as roads, rivers, and powerlines.

 The Census Bureau has assigned each CCD, alphabetically sequenced within
 county, an incremental unique 3-digit numeric code.  The National Bureau of
 Standards has assigned each CCD, alphabetically sequenced within State, an
 incremental unique 5-digit numeric FIPS "place" code.

 CCD boundaries are represented on detailed census maps, such as place maps
 and county maps.  In addition, CCD outlines appear at a small scale on maps
 published in several 1980 reports.  Statistics for about 5,500 CCD's appear
 in STF's 1A, 2B, 3A, and 4B, and in PC80-1-A and -B and HC80-1-A reports.

 Historical comparability:  In 1980, CCD's are defined in one fewer State
 than in 1970--North Dakota returned to the use of its MCD's (townships).
 However, 1980 data for North Dakota's 1970 CCD's are available in STF 1E.
 In the past, cities with 10,000 or more inhabitants generally were defined
 as separate CCD's.  When these cities annexed territory, CCD boundaries also
 had to be adjusted.  For 1980, many of these CCD boundaries were revised to
 conform with census tract boundaries where tracts exist, and permanent
 physical features elsewhere, in an attempt to minimize future CCD boundary
 adjustments.  Many CCD's which changed boundaries between 1970 and 1980 are
 noted in footnotes to table 4 of the PC80-1-A reports for States with CCD's.

 CENSUS SUBAREA.  A statistical subdivision of a "census area" or borough
 (county equivalent) in Alaska.  Census subareas take the place of minor
 civil divisions (MCD's or census county divisions (CCD's).

 Historical comparability:  In 1970, Alaska county equivalents were called
 "divisions," and some were subdivided further.  Some of the census subareas
 used in the 1980 census approximate the 1970 divisions or their subdivisions.

 CENSUS TRACT.  A small statistical subdivision of a county.  Tracts
 generally have stable boundaries.  When tracts are established, they are
 designed to be relatively homogeneous areas with respect to population
 characteristics, economic status, and living conditions.  Tracts generally
 have between 2,500 and 8,000 residents.  All standard metropolitan
 statistical areas (SMSA's) recognized for the 1980 census have census
 tracts.  Most of these SMSA's are completely tracted, but seven SMSA's newly
 created as a result of the 1980 census include outlying counties which are
 not tracted.  In addition, an estimated 3,000 census tracts have been
 established in 221 counties outside SMSA's.  Five States and the District of
 Columbia are entirely tracted:  Connecticut, Delaware, Hawaii, New Jersey,
 and Rhode Island.  In all, there are over 43,300 census tracts for the 1980
 census (excluding 465 in Puerto Rico).

 Census tract boundaries are established cooperatively by local Census
 Statistical Areas Committees and the Census Bureau in accordance with
 guidelines that impose limitations on population size and specify the need
 for visible boundaries.  Geographic shape and area size of tracts are of
 relatively minor importance.  Tract boundaries are established with the
 intention of being maintained over a long time so that statistical
 comparisons can be made from census to census.  Census tracts observe county
 lines and cover all of the territory within each tracted county.  Within a
 county, tract boundaries may be split by other geographic boundaries.

 Census tracts are identified by a 4-digit basic code and may have a 2-digit
 suffix, e.g., 6059.02.  On tape, the decimal is implied.  Many census tracts
 do not have a suffix.  In such cases, tapes give the 4-digit code followed
 by two blanks.  Leading zeros in a tract number (e.g., 0025.02) do not
 appear on the maps (e.g., 25.02.).

 Tract numbers are always unique within a county, and, except for the New
 York SMSA, are also unique within an SMSA.  All valid census tract numbers
 are in the range 0001 to 9899.99; a number between 9901 and 9989.99 denotes
 a block numbering area (BNA).

 Census tract boundaries are shown on all detailed census maps, such as place
 maps and county maps.  In addition, census tract outline maps are being
 created for each SMSA and each tracted county outside SMSA's.  Tract outline
 maps show only those streets and physical features which serve as census
 tract boundaries.  In addition, the boundaries of places, MCD's, CCD's,
 counties, and States appear on tract outline maps.

 Census tract data are presented in STF's 1A, 1B, 2A, 3A, and 4A, and in
 PHC80-2 Census Tracts reports.  In STF's 1A and 3A, tract data are presented
 in hierarchial sequence within place within MCD or CCD.  In a case where a
 tract is split by place, MCD, or CCD boundaries, the tape files will have
 summaries for each of its parts.  To get data for the whole tract, it will
 be necessary to add up the components.  In STF 1B the situation is similar
 except that MCD boundaries are observed in only 20 States and Puerto Rico.
 (See figure 4, column 3.)  MCD boundaries in the other 10 States with MCD's
 and CCD boundaries in the remaining 20 States are ignored.  In the major
 summaries for census tracts--those in STF's 2A and 4A and in PHC80-2 Census
 Tracts reports--tract summaries observe the boundaries of places of 10,000
 or more population.  Separate summaries provide totals for split tracts.

 Historical comparability:  Census tracts are defined with an overall goal of
 census-to-census comparability.  Some 1970 tracts have been subdivided due
 to increased population, but the new tracts can be recombined by the user
 for comparison with 1970 tracts.  This affects about 8 percent of all 1970
 tracts.  Other changes have included combinations of two or more small 1970
 tracts (less than 1 percent of all 1970 tracts) and adjustments to tract
 boundaries where old boundary features have disappeared or better boundaries
 (e.g., freeways) have come into being.  In a few areas, local Census
 Statistical Areas Committees undertook extensive redefinition of census
 tracts.

 Census Tracts reports, PHC80-2, include 1970-1980 tract comparability tables
 showing 1980 tracts which were split, combined, or had boundary realignments
 affecting areas with 100 or more people along with the 1970 tracts or parts
 of tracts to which they correspond.  The list is presented both ways:  1970
 tracts in terms of 1970 counterparts, and 1980 in terms of 1970
 counterparts.  Since the affected parts of individual tracts (e.g.,
 individual blocks) are not specified, the comparability list essentially
 serves to draw attention to areas which should be studied further on 1980
 and 1970 maps, preferably those which show detail by block.

 Both the number of tracted counties and the number of census tracts
 increased by over 20 percent between 1970 and 1980.  The reporting of data
 for split tracts has also increased.  Whereas 1970 Census Tracts reports
 gave data for tract parts created when tracts were split by the boundaries
 of only those places with 25,000 or more population, 1980 reports observe
 boundaries of places as small as 10,000.  1980 STF's 2 and 4 present data
 for the components of split tracts, as well as for whole tracts, whereas
 their 1970 counterparts did not provide separate summaries for the
 components of split tracts.

 CENTRAL BUSINESS DISTRICT (CBD).  An area of very high land valuation
 characterized by a high concentration of retail businesses, service
 businesses, offices, theaters, and hotels, and by a high traffic flow.  A
 CBD follows census tract boundaries, i.e., it consists of one or more whole
 census tracts.  CBD's are identified only in central cities of SMSA's and
 other cities with a population of 50,000 or more, and are designated by
 local Census Statistical Areas Committees in consultation with the Census
 Bureau.  However, some eligible cities have chosen not to participate in the
 CBD delineation program.  CBD's do not extend beyond the boundaries of the
 city.

 The CBD's now recognized were delineated for the 1977 Economic Censuses.
 The Bureau does not plan to prepare 1980 statistics for CBD's, but users may
 derive data by aggregating data for component census tracts or smaller
 areas.  Records for such areas are indicated on most machine-readable files.

 Historical comparability:  At the time of the 1970 census, CBD's were
 defined only in cities of 100,000 or more persons.

 CENTROID, POPULATION.  See POPULATION CENTROID.

 CENTRAL CITY.  See STANDARD METROPOLITAN STATISTICAL AREA; URBANIZED AREA.

 CONGRESSIONAL DISTRICT.  One of the 435 State or sub-State areas from which
 persons are elected to the U.S. House of Representatives.  Two sets of
 congressional districts are recognized in 1980 census products.  Districts
 of the 96th Congress (1979-1980) which were also in effect for the 97th
 Congress (1981-1982) are summarized on STF 1A and STF 3A.  Districts of the
 98th Congress (1983-1984) reflecting redistricting based on the 1980 census,
 are summarized on STF 1D and STF 3D and in series PHC80-4, Congressional
 Districts of the 98th Congress.

 The PHC80-4 reports, issued by State, include a map of the State showing
 congressional district boundaries in relation to county outlines.  More
 detailed maps follow showing selected congressional district boundaries in
 cases where the State map cannot delineate the congressional districts with
 sufficient clarity.  These maps have been republished in the Congressional
 District Atlas for the 98th Congress.  Congressional district boundaries are
 not shown on detailed 1980 census maps.

 Historical comparability:  Districts of the 96th Congress were the same as
 districts for the 93rd Congress for all but 4 States:  New York, California,
 and Texas, which were redistricted for the 94th Congress; and Tennessee, in
 which one boundary change took effect for the 95th Congress.  1970 data for
 these congressional districts were published in Congressional District Data
 (CDD) report series for the 93rd and 94th Congresses, but not including the
 later change for Tennessee.  The Congressional District Data Book
 republished CDD reports for the 93rd Congress.

 COUNTY.  The primary political and administrative subdivision of a State.
 In Louisiana, such divisions are called parishes.  In Alaska, 23 boroughs
 and "census areas" are treated as county equivalents for census purposes.
 Several cities (Baltimore, Maryland; St. Louis, Missouri; Carson City,
 Nevada; and 41 Virginia cities) are independent of any county organization,
 and thereby constitute primary divisions of their States and are treated the
 same as counties in census tabulations.

 County boundaries are shown on most census maps.  A 3-digit Federal
 Information Processing Standards (FIPS) county code identifies each county
 uniquely within State.  Counties are numbered in alphabetic sequence, with
 independent cities numbered separately at the end of the list.

 There are 3,215 counties and county equivalents (including 78 in Puerto
 Rico) recognized for the 1980 census.  Tabulations for all counties appear
 in STF's 1 through 4, and in PC80-1-A, -B, and -C, HC80-1-A and -B and
 PHC80-3 reports.  Tabulations for counties of 50,000 or more inhabitants
 appear in STF 5.

 Historical comparability:  A number of changes have occurred to county
 boundaries since 1970.  A new set of county equivalents (boroughs and census
 areas) has been defined for Alaska, and in some cases these county
 equivalents differ considerably from the census divisions recognized for
 1970.  In addition, there are minor changes in counties for South Dakota and
 Hawaii.  In Virginia, county boundaries have changed as a result of the
 creation of new independent cities or annexations by independent cities.
 Most other changes represent minor adjustments of the boundaries between
 counties.  Those counties which changed boundaries between 1970 and 1980 are
 noted in footnotes at the end of table 4 of the PC80-1-A report for each
 State.

 COUNTY EQUIVALENT.  See COUNTY.

 DIVISION (CENSUS GEOGRAPHIC).  A census geographic division is one of the
 nine groups of States which are subdivisions of the four census geographic
 regions of the United States.  Census geographic divisions are identified by
 a 1-digit code which is also the first digit of the 2-digit census
 geographic code for each State in the division.

 Historical comparability:  Census divisions have remained unchanged since
 the 1910 census, except for the expansion of the Pacific Division to include
 Alaska and Hawaii.

 ECONOMIC SUBREGION (ESR).  A grouping of State Economic Areas (SEA's) which
 brings together those SEA's which are most closely related in terms of their
 economic and social characteristics.  The areas were first defined following
 the 1950 census and updated after the 1960 census.  To achieve such
 homogeneity, State boundaries are frequently crossed.  The 510 SEA's are
 grouped into 121 ESR's.  A 3-digit numeric code is assigned to each ESR.  No
 data summaries will be prepared for ESR's, although the ESR code appears on
 the geographic records of the summary tape files.

 Historical comparability:  ESR boundaries have remained the same since 1960.

 See also:  STATE ECONOMIC AREA (SEA).

 ENUMERATION DISTRICT (ED).  An area used in the 1980 census for data
 collection activities and as a tabulation area where blocks are not
 present.  ED's do not cross the boundaries of legal or statistical areas;
 for example, census tracts, MCD's/CCD's, places, counties, congressional
 districts, and States.  Because of these constraints, they vary widely in
 population size, although they do not generally exceed a population of 1,600
 in areas where the census was taken by mail, or a population of 1,000 in
 areas where the census was taken by conventional enumerator canvassing.  The
 population limits are designed so that an ED generally represents a
 reasonable workload for one enumerator.  About 1,000 jurisdictions in 47
 States participated in a program for local definition of ED's.  In areas
 without blocks, ED's are the smallest unit of census geography for which
 statistics are prepared.

 ED boundaries are shown on MMS/VMS, place, and county maps in areas where
 there are no block numbers.  ED's are identified by a 4-digit number (except
 that leading zeros, when they occur in ED numbers, do not appear on the
 maps).  An ED number may be followed by a one-letter alphabetic suffix.  The
 suffix is used to identify subdivisions of ED's made during data collection
 and processing activities where the original ED proved to be too populous
 for an efficient work unit, or to accommodate a revision to a place or other
 boundary made after January 1, 1978 in mailout/mailback areas or January 1,
 1979 in conventional census areas.  An ED number may also have a one-letter
 prefix indicating that the ED is of a special type (e.g., an American Indian
 reservation), but the prefix is not necessary for unique identification of
 the ED.  ED numbers do not repeat within a county.  Any ED may be uniquely
 identified by accompanying its ED code with the 2-digit State code and
 3-digit county code.

 Statistics will be prepared for about 100,000 ED's.  ED data, together with
 data for BG's, appear on STF's 1A and 3A and corresponding microfiche.  In
 addition, ED data appear on STF 1B to complement the summaries for blocks.
 There are no printed data for ED's.

 Historical comparability:  Many areas which were covered by ED's in 1970 are
 summarized in terms of blocks and BG's for 1980.  In some cases, it may be
 possible to add up blocks to approximate the 1970 ED's, based on detailed
 comparison of 1980 and 1970 maps.

 In areas covered by ED's for 1980, enumeration considerations dictated ED
 size and design, and historical comparability does not normally enter into
 consideration.

 ESKIMO POPULATION.  See RACE.

 FAMILY.  Two or more persons, including the householder, who are related by
 birth, marriage, or adoption and who live together as one household; all
 such persons are considered as members of one family.  (Persons not in
 families and not inmates of institutions are classified as unrelated
 individuals.)  Families are defined using responses to the complete-count
 household relationship question.

 If the son/daughter of the person or couple who maintain the household and
 the son's or daughter's spouse and/or children are members of the household,
 they are treated as part of the householder's family.  A roomer/boarder and
 his/her spouse who are not related to the person or persons who maintain the
 household, or a resident employee and his/her spouse living in, are not
 counted as a family, but as individuals unrelated to the householder.  Thus,
 a household can contain only one family for purposes of census tabulations.

 A person maintaining a household alone, or two or more unrelated persons are
 regarded as a household but not as a family.  Thus, some households do not
 contain a family.

 (In certain Census Bureau surveys (e.g., CPS) before 1980, families as
 defined here are referred to as "primary families."  The term "secondary
 family" refers to a resident family unrelated to the householder, such as a
 roomer and his/her spouse.  Tabulations of families from such surveys
 include secondary families.)

 Historical comparability:  A similar definition for family was used in
 1970.  In 1960, secondary families were also identified.  In 1960, secondary
 families were also identified.

 GROUP QUARTERS, PERSONS IN.  Persons in living arrangements, such as nursing
 homes or rooming houses, which are not households.  Group quarters status
 was determined on a complete-count basis.

 Two general categories of persons in group quarters are recognized.

     Inmate of institution.  A person under care or custody at the time of
     enumeration.  Inmates are persons in such facilities as homes, schools,
     hospitals, or wards for the physically or mentally handicapped; persons
     in hospitals or wards for mental, tubercular, or chronic diseases;
     persons in homes for unmarried mothers; persons in nursing,
     convalescent, and rest homes for the aged and dependent; persons in
     orphanages; and persons in correctional institutions.  These persons are
     enumerated as residents of an institution--regardless of their length of
     stay in the particular place and regardless of the number of people in
     the places.  Some tabulations include data by major types of
     institutions (home for the aged, mental hospital, correctional
     institution, and other institutions).

     Other persons in group quarters.  Persons living in group quarters who
     are not inmates of institutions.  Rooming and boarding houses, communes,
     farm and nonfarm workers' dormitories, convents or monasteries, and
     other living quarters are classified as "other" group quarters if there
     are 9 or more persons unrelated to the person listed in column 1 of the
     census questionnaire; or if 10 or more unrelated persons share the
     unit.  Persons residing in certain other types of living arrangements
     are classified as living in "other" group quarters regardless of the
     number or relationship of people in the unit.  These include persons
     residing in military attacks, on ships, in college dormitories, or in
     sorority and fraternity houses; patients in general or maternity wards
     of hospitals who have no usual residence elsewhere; staff members in
     institutional quarters; and persons enumerated in missions, flophouses,
     Salvation Army shelters, railroad stations, etc.
H-O

 Historical comparability:  In 1970, 6 or more unrelated persons living
 together were classified as group quarters; for 1980 that requirement was
 raised to 10 or more unrelated persons.

 See also:  HOUSEHOLD, PERSONS IN.

 HISTORIC AREAS OF OKLAHOMA (EXCLUDING URBANIZED AREAS).  The historic areas
 of Oklahoma consist of the former reservations that had legally established
 boundaries during the period 1900-1907.  These reservations were dissolved
 during the 2- to 3-year period preceding the statehood of Oklahoma in 1907.
 The former reservation boundaries are used for planning purposes by tribes
 and the Federal government.  In the census, the entire area encompassing the
 former reservations was identified (except for parts inside urbanized areas
 as approximated in preparation for the 1980 census); individual former
 reservations were not identified separately.

 The historic areas of Oklahoma (excluding urbanized areas) were assigned a
 unique 3-digit code by the Bureau which appears in the reservation code
 field.  Enumeration districts (ED's), block groups (BG's), and/or portions
 of BG's that comprise the historic areas (excluding urbanized areas) are
 designated with an "A" in the ED prefix ield in tape files for Oklahoma.

 Historical comparability:  Historic areas of Oklahoma (excluding urbanized
 areas) were not identified in previous censuses.

 HOUSEHOLD, PERSONS IN.  The number of persons living in the housing unit.
 All occupants are counted--not just those related to the householder, but
 also any lodgers, roomers, boarders, partners, wards, foster children, and
 resident employees who share the living quarters.

 Figures for "persons in households" match those for "persons in units" in
 tabulations based on complete-count data.  In sample tabulations, they may
 differ because of the weighting process.  The phrase "persons in household"
 is used for population tabulations, "persons in unit" for housing items.
 "One-person households" and "persons living alone" are synonymous.

 See also:  FAMILY.

 HOUSING UNIT.  A house, apartment, mobile home or trailer, group of rooms,
 or single room occupied as a separate living quarter or, if vacant, intended
 for occupancy as a separate living quarter.  Separate living quarters are
 those in which the occupants live and eat separately from any other persons
 in the building and which have direct access from the outside of the
 building or through a common hall.

 The occupants may be a single family, one person living alone, two or more
 families living together, or any other group of related or unrelated persons
 who share living arrangements (except as described in the definition of
 Group Quarters, Persons In).  For vacant units, the criteria of separateness
 and direct access are applied to the intended occupants whenever possible.
 If that information cannot be obtained, the criteria are applied to the
 previous occupants.  Both occupied and vacant housing units are included in
 the housing inventory, except that recreational vehicles, caves, boats,
 tents, railroad cars, and the like are included only if they are occupied as
 someone's usual place of residence.  Vacant mobile homes are included
 provided they are intended for occupancy on the site where they stand.
 Vacant mobile homes on dealers' sales lots, at the factory, or in storage
 yards are excluded from the housing inventory.  Housing unit status was
 determined on a complete-count basis.

 Historical comparability:  The first Census of Housing in 1940 established
 the "dwelling unit" concept.  Although the term became "housing unit" and
 the definition has been modified slightly in each succeeding census, the
 1980 definition is essentially comparable to previous censuses.  In 1970,
 the definition of a housing unit stipulated that the occupants live and eat
 separately and have either direct access or complete kitchen facilities.
 For 1980, direct access is required; the alternative of complete kitchen
 facilities has been dropped.  In 1970, vacant mobile homes were not
 counted.  In 1980, vacant mobile homes as included in the housing inventory
 if they intended for occupancy where they stand.  Also in 1970, units with
 six or more unrelated persons living together were classified as group
 quarters; for 1980 that requirement was raised to ten or more unrelated
 persons.

 See also:  GROUP QUARTERS, PERSONS IN; OCCUPANCY STATUS; TENURE.

 LAND AREA.  Land area measurements are calculated to the nearest hundredth
 of a square mile for States, counties, county subdivisions with a 1980
 census population of 2,500 or more (for the States of Connecticut, Maine,
 Massachusetts, Michigan, New Hampshire, New Jersey, New York, Pennsylvania,
 Rhode Island, Vermont, and Wisconsin only), county subdivisions with a 1980
 census population of less than 2,500 that are within an SMSA (for the States
 of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, and
 Vermont only), and places with a 1980 census population of 2,500 or more.

 In contrast to population centroids on MARF 2, only whole-place land area
 totals are repeated on all "part" records for a place split by higher-level
 geography.  The land area field is blank for:  (1) the "balances" of county
 subdivisions and; (2) on the county subdivision record immediately preceding
 the place record for a place of 2,500 or more population that also is
 treated as a county subdivision.  The decimal point is shown in the data for
 this field.  Figures are right-justified without leading zeros.  The value
 for land area in square kilometers can be obtained by multiplying the square
 miles figure by 2.59.

 MINOR CIVIL DIVISION (MCD).  A primary political and administrative
 subdivision of a county.  MCD's are most frequently known as townships, but
 in some States they include towns, magisterial districts, and similar
 areas.  A few counties have some territory not organized into MCD's; such
 "unorganized territory" is treated as one or more MCD's for census purposes.

 MCD's are used for census purposes in 29 States (see figure 4, column 2).
 In 20 of the remaining States, CCD's are used in lieu of MCD's and in
 Alaska, census subareas are used.  In the District of Columbia, quandrants
 are used.  In Puerto Rico, ciudades, pueblos, and barrios are used.

 The Census Bureau has assigned each MCD, alphabetically sequenced within
 county, an incremental unique 3-digit numeric code.  In addition, MCD's in
 11 States (those noted in column 4 of figure 4) have a 4-digit "MCD sequence
 number" which allows MCD's to be sorted into alphabetical sequence within a
 State.

 MCD boundaries are represented on all detailed census maps.  In addition,
 MCD outlines appear on small-scale maps published in PC80-1-A and -B and
 HC80-1-A reports and in conjunction with the PHC80-2 series.  There are more
 than 26,000 MCD's recognized for the 1980 census.

 Statistics for all MCD's appear in STF's 1A, 2B, 3A, and 4B, and in PC80-1-A
 and -B and HC80-1-A reports.  In 20 States (specified in column 3 of figure
 4), many MCD's serve as functioning general-purpose governments, and these
 active MCD's are included in PHC80-3 Summary Characteristics for
 Governmental Units and Standard Metropolitan Statistical Areas.  All MCD's
 in block-numbered areas of these States are included in the PHC80-1.  Block

 Statistics microfiche series and STF 1B.  Finally, in 11 States (all 9
 States in the Northeast region, plus Michigan and Wisconsin), MCD data are
 published in a manner parallel to that of places of the same population size
 in tables of PC80-1-B and -C and HC80-1-A and -B.  (See figure 4, column 4.)

 Historical comparability:  CCD's were used in North Dakota in 1970, but for
 1980 that State returned to the use of its townships.  A number of MCD's in
 other States have changed boundaries.  Changes have resulted from municipal
 annexations, mergers or dissolutions of MCD's, and other causes.  There are
 seven States where MCD boundaries have changed substantially:  Arkansas,
 Louisiana, Maryland, Mississippi, Nebraska, Virginia, and West Virginia.
 MCD's which have changed boundaries between 1970 and 1980 are noted in
 footnotes to table 4 of PC80-1-A reports for States with MCD's.

 MUNICIPIO.  See PUERTO RICO and OUTLYING AREAS.

 OCCUPANCY STATUS.  The classification of all housing units as either
 occupied or vacant.  The item was determined on a complete-count basis.

     Occupied.  A housing unit occupied as the usual place of residence of a
     person or group of persons living in it at the time of enumeration, or
     by occupants only temporarily absent such as on vacation.  A household
     consists of all the persons who occupy a housing unit as their usual
     place of residence.  If all the persons staying in the unit at the time
     of enumeration have their usual place of residence elsewhere, the unit
     is classified as vacant.  Complete count figures on households and
     occupied housing units should match--although sample estimates of
     households and occupied units may differ because of weighting.

     Vacant.  A housing unit with no one living in it at the time of
     enumeration, unless its occupants are only temporarily absent.  If, at
     the time of enumeration, the unit is temporarily occupied solely by
     persons who have a usual residence elsewhere, it is classified as vacant.

 Historical comparability:  Similar data have been collected since 1940.

 OTHER RACES.  See RACE.

 OWNER-OCCUPIED HOUSING UNITS.  See TENURE.
P-R

 PACIFIC ISLANDER POPULATION.  See RACE.

 PARISH (IN LOUISIANA).  See COUNTY.

 PER CAPITA INCOME.  Per capita income is the mean or average income computed
 by aggregating the total income for every man, woman, and child in a
 particular population group or geographic area.  It is derived by dividing
 the total income by the total population.

 Care should be exercised in using and interpreting per capita (mean or
 average) values for small geographic areas or population groups.  Since per
 capita income amounts are strongly influenced by extreme values in the
 distribution, they are especially susceptible to the effects of sampling
 variability, misreporting, and processing errors.

 PERSONS IN HOUSEHOLD.  See HOUSEHOLD, PERSONS IN.

 PLACE.  A concentration of population which may or may not have legally
 prescribed limits, powers, or functions.  Most of the places identified in
 the 1980 census are incorporated as cities, towns, villages, or boroughs.
 In addition, census designated places (called "unincorporated places" in
 earlier censuses) are delineated for 1980 census tabulations.  There are
 about 23,000 places recorded in the 1980 census.  Places do not cross State
 boundaries.

     Incorporated place.  A political unit incorporated as a city, borough
     (excluding Alaska and New York), village, or town (excluding the New
     England States, New York, and Wisconsin).  In most States, incorporated
     places are subdivisions of the MCD or CCD in which they are located; for
     example, a village located within and legally part of a township.  In
     some States, incorporated places are independent of surrounding
     townships or towns and therefore are also treated as MCD's.  In a few
     States, the pattern is mixed.  Almost 4,000 incorporated places cross
     MCD/CCD and/or county boundaries.

     There are about 20,000 incorporated places recognized in the 1980 census.

     Census designated place (CDP).  A densely settled population center
     without legally defined corporate limits or corporate powers or
     functions.  Each CDP has a definite residential nucleus with a dense,
     city-type street pattern, and ideally should have an overall population
     density of at least 1,000 persons per square mile.  In addition, a CDP
     is a community that can be identified locally by place name.  Boundaries
     of CDP's are drawn by the Census Bureau, in cooperation with State and
     local agencies, to include, insofar as possible, all the closely settled
     area.  In the 1980 census, statistics are tabulated for each CDP with
     5,000 inhabitants or more if located in an urbanized area (UA) with a
     central city of 50,000 or more and for each CDP of 1,000 inhabitants or
     more if in a UA with no central city of 50,000 or more.  Some
     CDP's--notably in the Northeast--coincide with MCD's.  In STF's, these
     are treated as both places and MCD's, but in printed reports they are
     shown only in MCD tables to avoid duplication.  Outside of UA's,
     statistics are tabulated in the 48 States and Puerto Rico for CDP's of
     1,000 or more, in Hawaii for CDP's of 300 or more, and in Alaska for
     CDP's of 25 or more.

     There are approximately 3,400 CDP's recognized in the 1980 census.

 Incorporated place and CDP boundaries are shown on all detailed census
 maps.  For tracted areas, boundaries of all places are shown on census tract
 outline maps.  County subdivision maps, at still smaller scale, also show
 boundaries for places.

 A 4-digit numeric code is assigned by the Census Bureau to each place in
 alphabetic sequence within State.  "Place description" codes will also
 generally accompany place records.  These codes indicate whether or not a
 place is incorporated, as well as represent certain other information about
 the place.  A 5-digit Federal Information Processing Standards (FIPS) code
 is also assigned to each county subdivision (MCD/CCD) and place in the 1980
 census (as well as to a variety of non-census areas, such as airports and
 parks).

 Data are summarized for all places in STF's 1A and 3A and PC80-1-A reports.
 For places with 1,000 or more inhabitants, data are summarized in STF 2B,
 and PC80-1-B and HC80-1-A reports.  For places with 2,500 or more, data are
 summarized in STF 4B, PC80-1-C, and HC80-1-B reports.  In PHC80-3 reports,
 data are given for all incorporated places.  In the PHC80-2 Census Tracts
 reports and STF's 2A and 4A, summaries are presented only for places with
 10,000 or more inhabitants located in tracted areas.  Very detailed data are
 presented for all places which are central cities of SMSA's in PC80-1-D
 reports, and places with 50,000 or more inhabitants in HC80-2 reports.  STF
 5 also provides detailed data for places of 50,000 or more.

 The files and reports which sequence geographic units in hierarchial fashion
 must account for the fact that places may cross the boundaries of counties,
 MCD's, and CCD's.  Such reports and tapes, therefore, provide summaries for
 the various parts of places created when places are split by the boundaries
 of higher-level areas recognized in the hierarchy.  Specifically, place
 parts within county and MCD or CCD are presented in STF's 1A and 3A, and
 PC80-1-A.  Place parts within county and MCD are presented for 20 specified
 States and Puerto Rico in STF 1B and PHC80-1 Block Statistics microfiche
 reports, but the PHC80-1 reports include only places which have data
 collected for blocks.  In the remaining 30 States, STF 1B and PHC80-1
 reports subdivide places when split by county boundaries, but do not observe
 MCD or CCD boundaries.

 Historical comparability:  Sixty-eight percent of all incorporated places of
 2,500 or more made changes in their boundaries between 1970 and January 1,
 1980, which is the reference date for boundaries in the 1980 census.  In the
 1970 census, ED boundaries were drawn so as to allow a user to aggregate
 1970 data for each city of 2,000 or more inhabitants according to 1960
 boundaries.  There will not be a corresponding capability in the 1980 census.

 In the 1970 and earlier censuses, CDP's were referred to as "unincorporated
 places."  The name was changed to make it more explicit that such places are
 defined for census purposes, and to avoid confusion in States where many
 "unincorporated places" are parts of incorporated towns or townships.  Many

 CDP's have been redefined since 1970.  Incorporated places which were newly
 incorporated or which changed boundaries between 1970 and 1980 are listed in
 footnotes to table 4 of PC80-1-A reports.

 POPULATION CENTROID.  MARF 2 provides geographic coordinates, expressed in
 decimal degrees of latitude and longitude to four decimal places (decimal is
 not shown), for the estimated population centroid of each tabulated
 enumeration district (ED) and block group (BG).  The figures are
 right-justified without leading zeros; directions (north latitude and west
 longitude) are not shown.  Where a BG is split by higher-level geography
 that appears on published maps--i.e., county subdivision, place, urbanized
 area, American Indian reservation and Alaska Native village--coordinate
 values are not provided for the entire BG, but only for each split piece.
 Separate coordinates are not provided for the portions of a BG split by
 congressional district (96th Congress) or American Indian reservation
 subreservation area; that is, such BG records are all assigned the same set
 of coordinates.

 Population centroid coordinates are calculated either by an arithmetic
 computer algorithm applied to block boundaries as recorded in digitized
 GBF/DIME-Files or, elsewhere, digitized directly from a population centroid
 that has been approximated manually.  A centroid must be located within its
 ED/BG except where determined via the computer algorithm.  In cases where
 there are irreconcilable discrepancies between census maps and census data
 files, the coordinates are those of the area to which the population should
 have been allocated or, if unpopulated, those of the next higher level of
 geography associated with the nonmapped MARF record.

 Coordinate values are provided for higher geographic levels (census tracts,
 places, county subdivisions, counties, and States) based on weighted
 averages of individual component ED and/or BG values.  In cases where all
 the components of a higher-level geographic area had a population of zero,
 an implied population of one was used in the averaging formula.  As with
 BG's, MARF 2 does not provide coordinate values for entire census tracts or
 places that are split by higher-level geography, but only for each split
 part.  For a place that also serves as a county subdivision, the centroid
 values duplicate on the county subdivision record immediately preceding the
 place record.  Centroid coordinates are provided for the remainder of county
 subdivisions; in some instances, these values will be located within a place
 rather than in the "remainder" area.

 PUERTO RICO AND OUTLYING AREAS.  In addition to the United States, the
 decennial census covers Puerto Rico, American Samoa, Guam, the Trust
 Territory of the Pacific Islands (including the Northern Mariana Islands
 which were legally part of the Trust Territory in 1980), the Virgin Islands
 of the United States, and certain other small islands over which the United
 States exercises sovereignty or jurisdiction.  Questionnaire design and the
 questions asked were developed for Puerto Rico and each outlying area to
 accommodate local conditions.  In the case of some small or
 military-occupied islands, enumerations were not conducted; only population
 counts obtained from U.S. Government records are published.

 The geographic subareas for which statistics are reported vary.  Some of
 those noted below are defined in this glossary; others will be defined in
 1980 census reports for the areas.

     American Samoa:  villages, district subdivisions, districts, and islands.

     Guam:  census designated places and election districts.

     Puerto Rico:  blocks; ED's and BG's; census tracts and block numbering
     areas; zonas urbanas and aldeas; subbarrios; barrios, ciudades, and
     pueblos; municipios; and SMSA's and SCSA's.

     Trust Territory of the Pacific Islands (including the Northern Mariana
     Islands):  census designated places, municipal districts, municipalities
     and islands, and administrative districts.

     Virgin Islands:  places, census subdistricts, and islands.

     Other islands:  no subdivisions.

 Data for Puerto Rico and its subdivisions will appear in reports and tapes
 in generally the same pattern as for States and their subdivisions.  Data
 for outlying areas will appear in 1980 Census of Population, Volume 1, and
 1980 Census of Housing, Volume 1, reports, and on STF's 1 and 3.

 Historical comparability:  The Canal Zone was not included in the 1980
 census because it was no longer under U.S. jurisdiction.

 Race, all persons were asked to identify themselves according to the
 following race categories on the 1980 questionnaire:  White, Black or Negro,
 American Indian, Eskimo, Aleut, Japanese, Chinese, Filipino, Korean, Asian
 Indian, Vietnamese, Hawaiian, Guamanian, Samoan, and other.  The "other"
 category includes Malayan, Polynesian, Thai, and other groups not included
 in the specific categories listed on the questionnaire.  This item was asked
 on a complete-count basis.

 The concept of race as used by the Census Bureau reflects
 self-identification by respondents; it does not denote any clear-cut
 scientific definition of biological stock.  Since the 1980 census obtained
 information on race through self-identification, the data represent
 self-classification by people according to the race with which they identify
 themselves.  For persons with parents of different races who could not
 provide a single response to the race question, the race of the person's
 mother was used; however, if a single response could not be provided for the
 person's mother, the first race reported by the person was used.

 Edit and review operations were performed during the complete-count
 tabulations; write-in responses were reviewed in an attempt to classify
 entries in specific categories, where appropriate.  For instance, if the

 "Other" circle was marked with a write-in entry "Caucasian," then the
 response recoded as White.  (Additional examples are noted below.)  However,
 all such cases were not specified in the complete-count processing.  During
 the processing of sample questionnaires, a more thorough review and
 additional editing was done to resolve inconsistent or incomplete
 responses.  Also, during the processing of sample questionnaires, write-in
 entries for the "Other" category were assigned specific codes, which were
 included on the person's basic record in the census detailed tape files.

 Asian and Pacific Islander write-in entries, such as Indo-Chinese,
 Cambodian, or Polynesian, included in the "Other" category during
 100-percent processing, are collectively tabulated and shown as "Other Asian
 and Pacific Islander" in the census sample tabulations; this group, "Other
 Asian and Pacific Islander," will be included in the broader Asian and
 Pacific Islander category in all sample tabulations by race.  This shift of
 "Other Asian and Pacific Islander" entries out of the "Other races" category
 in sample tabulations and the recoding of write-in entries in the "Other"
 category to specific categories where appropriate will affect the
 comparability between complete-count and sample data for some groups in
 certain geographic areas.

     White.  Persons who indicated their race as White, as well as persons
     who did not classify themselves in one of the specific race categories
     listed on the questionnaire but entered a response such as Canadian,
     German, Italian, Lebanese, or Polish.  (Persons who did not classify
     themselves in one of the specific race categories but wrote in entries
     such as Cuban, Puerto Rican, Mexican, or Dominican were included in the
     "Other races" category; in the 1970 census most of these persons were
     included in the "White" category.)

     Black.  Persons who indicated their race as Black or Negro, as well as
     persons who did not classify themselves in one of the specific race
     categories, but reported entries such as Black Puerto Rican, Hatian,
     Jamaican, Nigerian, or West Indian.

     American Indian, Eskimo, and Aleut:

          American Indian.  Persons who indicated their race as "Indian
          (American)" or who did not indicate a specific race category but
          reported the name of an Indian tribe.

          Eskimo.  Persons who indicated their race as "Eskimo."

          Aleut.  Persons who indicated their race as "Aleut."

     Asian and Pacific Islander:  In complete-count tabulations, includes all
     of the groups listed below except "Other Asian and Pacific Islander."
     In sample tabulations, it includes all of the groups listed below.

          Japanese.  Persons who indicated their race as Japanese, as well as
          persons who did not classify themselves in one of the specific race
          categories, but entered a response such as Nipponese or Japanese
          American.

          Chinese.  Persons who indicated their race as Chinese, as well as
          persons who did not classify themselves in one of the specific race
          categories, but reported entries such as Cantonese, Formosan,
          Taiwanese, or Tibetan.

          Filipino.  Persons who indicated their race as Filipino, as well as
          persons who did not classify themselves in one of the specific race
          categories, but entered a response such as Filipino American or
          Philippine.

          Korean.  Persons who indicated their race as Korean, as well as
          persons who did not classify themselves in one of the specific race
          categories, but reported a response such as Korean American.

          Asian Indian.Persons who indicated their race as Asian Indian, as
          well as persons who did not classify themselves in one of the
          specific race categories, but reported entries such as Bengali,
          Bharati, Dravidian, East Indian, Goanese, Hindu Indic, Kashmiri, or
          South Asian.

          Vietnamese.  Persons who indicated their race as Vietnamese, as
          well as persons who did not classify themselves in one of the
          specific race categories, but reported a response such as Vietnam.

          Hawaiian.  Persons who indicated their race as Hawaiian.  In the
          State of Hawaii, all persons who reported "Part-Hawaiian" were
          included in this category.

          Guamanian.  Persons who indicated their race as Guamanian, as well
          as persons who did not classify themselves in one of the specific
          race categories, but reported an entry such as Chamorro or Guam.

          Samoan.  Persons who indicated their race as Samoan, as well as
          persons who did not classify themselves in one of the specific race
          categories, but entered a response such as American Samoan or
          Western Samoan.

          Other Asian and Pacific Islander.  In sample tabulations only,
          persons who reported Cambodian, Hmong, Indo-Chinese, Laotian,
          Pakistani, Polynesian, Fiji Islander, Tahitian, Thai, or similar
          responses.  Census basic records include codes for over 50 separate
          groups within this category.  In complete-count tabulations, this
          group is part of the "Other races" category described below.

          Other (Race n.e.c. "not elsewhere classified").  Includes all other
          races (except "Other Asian and Pacific Islander" groups) which were
          not included in the specific categories listed on the
          questionnaire.  For example, persons reporting in the "Other" race
          category and providing write-in entries such as Eurasian,
          Cosmopolitan, Inter-racial, or a Spanish origin group (e.g.,
          Mexican, Cuban, or Puerto Rican) were included in Race, n.e.c.
          (NOTE-  These groups were also included in the "Other" race
          category in complete count tabulations.  However, other Asian and
          Pacific Islander groups are included in the "Other" category in
          100-percent tabulations only.)  STF 3, STF 4, and public-use
          microdata samples separately identify, as a subcategory within
          "Race, n.e.c.," persons who wrote in an entry implying Spanish
          origin.  Such entries are not necessarily consistent with responses
          in the Spanish origin question.

          In a few tables in which data for American Indian, Eskimo, Aleut,
          and Asian and Pacific Islander are not presented separately, the
          "Other" category encompasses all race categories not shown
          separately.

          In some tabulations, the "other" or "Race, n.e.c." category is
          omitted to save space; data for this category are derivable by
          subtracting the sum of the specified race categories from the total.

 On certain printed tables, where space is limited, data for persons of
 Spanish Origin are presented alongside data for up to four major race
 groups.  In such situations, users should not be misled by the proximity of
 these two types of data.  Spanish origin is not a race category, and persons
 of Spanish origin may be of any race.  Tabulations in a number of sources
 present data separately for race categories (.e.g, White, Black, and
 "Other") for persons not of Spanish origin.  In addition, the number of
 Spanish-origin persons is given by race.

 Limitations:  In previous censuses, undercoverage of the population has been
 associated with race.  The 1970 census missed Blacks at a much higher rate
 than Whites.  The Bureau has not prepared undercoverage rates for races
 other than White or Black, because vital records and other sources of
 relevant statistics do not consistently distinguish among other races.

 Historical comparability:  Questions on "race" or "color" have been asked in
 each census since 1970.  In 1970, when persons with parents of different
 races were in doubt as to their classification, the race of the father was
 used.  In 1980, the race of the mother was used for persons who could not
 provide a single response.  The 1970 category "Negro or Black" has been
 retitled "Black or Negro."  Individual categories for Vietnamese, Asian
 Indian, Guamanian, and Samoan were added.  In 1970, the categories Eskimo
 and Aleut appeared only on questionnaires used in Alaska; they were replaced
 by Hawaiian and Korean in all other States.  In 1980, all four categories
 appeared on the questionnaire.  As a result of the additions, the 1980
 questionnaire had 14 specific race categories instead of 8 as in 1970.

 In 1970, persons who did not report a specific race but wrote in Hispanic
 categories such as "Mexican," "Puerto Rican," or "Cuban" in the race
 question were assigned to White; for 1980 these persons remain in the "Other
 races" category.

 See also:  SPANISH ORIGIN.

 REGION (CENSUS GEOGRAPHIC).  A large group of States which is a first-order
 subdivision of the United States for census purposes.  The four
 regions--Northeast, North Central, South, and West--are delineated in figure
 5.  Regions are identified by a 1-digit code.  Statistics for them appear in
 U.S. Summary reports in almost every publication series, and in STF's 1C,
 2C, 3C, 4C, and 5C.  The census regions have no relationship to the 10
 Standard Federal Administrative Regions.
S-Z

 SPANISH ORIGIN.  Determined by a complete-count question which asks
 respondents to self-identify whether they are of Spanish origin or descent.
 If, when interviewed, the person reported a multiple origin and could not
 provide a single origin, the origin of the person's mother was used.  If a
 single response was not provided for the person's mother, the first reported
 origin of the person was used.

 Persons marking any one of the four "Spanish" categories, i.e., Mexican,
 Puerto Rican, Cuban, or other Spanish, are collectively referred to as
 "Persons of Spanish origin."

 In certain tabulations, persons of Spanish origin are further classified by
 type:

     Mexican.  Persons who indicated "Mexican,  Mexican-American, Chicano,"
     or wrote in an entry such as "La Raza."

     Puerto Rican.  Persons who indicated "Puerto Rican" or wrote in an entry
     such as Boricua."

     Cuban.  Persons who indicated "Cuban."

     Other Spanish.  Persons who filled the circle for "other
     Spanish/Hispanic;" or persons who wrote in an origin or descent
     associated with Spain, the Dominican Republic, or any Central or South
     America country except Brazil or a nonspecific Spanish group such as
     "Spanish surnamed" or "Spanish speaking."

 Preliminary evaluations of 1980 census data suggest some limited
 misreporting of Spanish origin.  Available evidence indicates that the
 misreporting may have occurred only in selected areas with relatively small
 Spanish-origin populations, such as in some Southern States, but it is not
 apparent in those areas with the largest concentrations of Spanish-origin
 persons.  For a fuller discussion of the reporting in the Spanish-origin
 item, see the 1980 census Supplementary Report, "Persons of Spanish Origin
 by State:  1980" (PC80-S1-7).

 Historical comparability:  The Spanish-origin question was asked on a
 100-percent basis for the first time in 1980.  A similar question was asked
 on the 1970 5-percent sample questionnaire.  For 1980, the category "no, not
 Spanish/Hispanic" appeared first (the corresponding category appeared last
 in 1970).  Also, the terms "Mexican-American" and "Chicano" are added to the
 term "Mexican."  The category Central or South American," included in 1970,
 has been dropped.

 Although a question on Spanish origin was included in 1970, it was not the
 major identifier used to classify the Hispanic population in the 1970 census
 as it is in 1980.  Depending on the section of the country, 1970 census data
 for "Persons of Spanish Heritage" were variously defined as "Persons of
 Puerto Rican Birth or Parentage" (in New York, New Jersey, and
 Pennsylvania); as "Persons of Spanish Language or Spanish Surname" (in
 Arizona, California, Colorado, New Mexico, and Texas); and as "Persons of
 Spanish Language" (in the remaining 42 States and the District of
 Columbia).  "Spanish Language" referred to those persons who in 1970
 reported Spanish as their mother tongue, as well as persons in families in
 which the household head or spouse reported Spanish as his or her mother
 tongue.

 STANDARD CONSOLIDATED STATISTICAL AREA (SCSA).  A large concentration of
 metropolitan population composed of two or more contiguous standard
 metropolitan statistical areas (SMSA's) which together meet certain criteria
 of population size, urban character, social and economic integration, and/or
 contiguity of urbanized areas.  Each SCSA must have a population of one
 million or more.  Thirteen SCSA's were in existence at the time of the 1980
 census.  They were defined by the Office of Management and Budget According
 to criteria published by that office in Standard Metropolitan Statistical
 Areas:  1975.  Four additional SCSA's have been defined based on 1980 census
 results.  Standard Metropolitan Statistical Areas:  1975.  Four additional
 SCSA's have been defined based on 1980 census results.

 SCSA's are identified by a 2-digit numeric code.  Summaries for SCSA's
 appear in many reports and in STF's 1C, 2C, 3C, 4C, and 5C.  Summaries are
 generally provided for SCSA totals and for within-State parts of SCSA's.

 Historical comparability:  The original 13 SCSA's were designated in 1975.
 For the 1960 and 1970 censuses, the Census Bureau recognized two "Standard
 Consolidated Areas" (SCA's), which encompassed metropolitan complexes around
 New York and Chicago.

 In 1983, the SCSA concept will be replaced by the new Consolidated
 Metropolitan Statistical Area (CMSA) concept, with somewhat more flexible
 criteria, as spelled out in the Federal Register, January 3, 1980.  These
 changes will not affect publication of the 1980 census data for SCSA's.

 STANDARD METROPOLITAN STATISTICAL AREA (SMSA).  A large population nucleus
 and nearby communities which have a high degree of economic and social
 integration with that nucleus.  Each SMSA consists of one or more entire
 counties (or county equivalents) that meet specified standards pertaining to
 population, commuting ties, and metropolitan character.  In New England,
 towns and cities, rather than counties, are the basic units and should be
 substituted for "counties" where counties are cited below.  SMSA's are
 designated by the Office of Management and Budget.

 Data products from the 1980 census will report on 323 SMSA's:  (1) 287
 defined before January 1, 1980 (including 4 in Puerto Rico); and (2) an
 additional 36 (including one in Puerto Rico) established as a result of 1980
 census population counts.  The 36 new SMSA's were designated when 1980
 counts showed that they met one or both of the following criteria:

     1.  Included a city with a population of at least 50,000 within its
         corporate limits, or

     2.  Included a Census Bureau-defined urbanized area (which must have a
         population of at least 50,000) and a total SMSA population of at
         least 100,000 (or, in New England, 75,000).

 An SMSA includes a city and, generally, its entire UA and the remainder of
 the county or counties in which the UA is located.  An SMSA also includes
 such additional outlying counties which meet specified criteria relating to
 metropolitan character and level of commuting of workers into the central
 city or counties.  Specific criteria governing the definition of SMSA's
 recognized before 1980 are published in Standard Metropolitan Statistical
 Areas:  1975, issued by the Office of Management and Budget.

 With two exceptions, each SMSA has one or more central cities, up to a
 maximum of three, and the names of these cities comprise the title, and of
 the SMSA.  The Nassau-Suffolk, NY SMSA has no central city, and the title of
 the Northeast Pennsylvania SMSA does not contain the names of and three
 central cities:  Scranton, Wilkes-Barre, and Hazleton.

 SMSA's are identified by a FIPS 4-digit numeric code, which follows the
 alphabetic sequence of SMSA names.  SMSA's are outlined on small-scale maps
 in several 1980 report series.  SMSA data appear in most 1980 census
 publications and summary tape files.  Many SMSA's cross State boundaries,
 and reports in several series provide summaries for the State parts of
 multi-State SMSA's, as well as SMSA totals.  Summary tape files present data
 only for State parts of SMSA's, except for the "national" files:  STF's 1C,
 2C, 3C, and 4C.

 Historical comparability:  A comparison of 1970 and 1980 census products
 reveals two types of changes in metropolitan territory.  First, 69 new
 SMSA's were created from previously nonmetropolitan territory:  36 were
 defined in 1981 based on 1980 population counts and 33 were defined between

 1973 and 1979 based on current population estimates.  (An additional
 SMSA--Rapid City, SD--was provisionally recognized based on population
 estimates, but it did not qualify according to 1980 census data.)

 The second component of change to metropolitan territory between 1970 and
 1980 was the redefinition of many of the SMSA's which were recognized in
 1970 census tabulations.  Of the 247 1970 SMSA's, 101 were redefined in 1973
 based on 1970 census commuting data, most by the addition of one or more
 counties (or towns and cities in New England).  In addition, one SMSA was
 redefined by the addition of one area and the deletion of another (Wichita
 Falls, Texas), one was subdivided (Nassau-Suffolk SMSA was created from a
 part of the New York SMSA), four pairs of SMSA's were combined into single
 SMSA's (for example, Dallas-Fort Worth, Texas), and four SMSA's lost area
 that was added to other SMSA's.  In addition, the names of several SMSA's
 were changed in 1973, one in such a way that the SMSA code also changed (San
 Bernardino-Riverside-Ontario to Riverside-San Bernardino-Ontario,
 California).

 Since SMSA's are always defined in terms of whole counties (towns or cities
 in New England) for which extensive data are available, users can usually
 compile figures for comparisons over time.

 In 1983, SMSA boundaries will be re-evaluated using 1980 census data on
 commuting, labor force, population density, type of residence, and
 population growth, according to new criteria spelled out in the Federal
 Register, January 3, 1980 (vol. 45, no. 2, pt. VI).  At that ime, new
 outlying counties may be added or existing ones deleted, some area titles
 will be changed, some new central cities will be designated, some areas may
 be consolidated, and a few new SMSA's may be created.  Further, the term
 "standard metropolitan statistical area" will be shortened to "metropolitan
 statistical area" (MSA).  These changes will not affect publication of 1980
 census data for SMSA's.

 STATE.  The major political unit of the United States.  The District of
 Columbia is treated as a State-equivalent in all 1980 census data series.
 Puerto Rico is also, except that it does not appear in the P.L. 94-171
 population counts file.  American Samoa, Guam, Northern Mariana Islands, the
 remainder of the Trust Territory of the Pacific Islands, and the U.S. Virgin
 Islands are treated as State equivalents for the presentation of data from
 1980 census volume 1 reports, but data for these areas will be available on
 computer tape only on STF's 1 and 3.  States are identified by a 2-digit
 FIPS code which follows the alphabetic sequence of State names (including
 the District of Columbia), and by a 2-digit census geographic State code,
 the first digit of which identifies the census division of which the State
 is a part.  Puerto Rico and the outlying areas have FIPS codes numerally
 following the State codes.

 Historical comparability:  There have been no significant changes to State
 boundaries in the last decade.  Data for the Northern Mariana Islands are
 reported separately from the remainder of the Trust Territory for the 1980
 census.

 See also:  PUERTO RICO AND OUTLYING AREAS.

 STATE ECONOMIC AREA (SEA).  A single county or group of counties within a
 State, which is relatively homogeneous with respect to economic and social
 characteristics.  The grouping of the 3,103 counties or county equivalents
 in 1950 into SEA's was the product of a special study prepared by the Bureau
 of the Census in cooperation with the Bureau of Agricultural Economics and
 several State and private agencies.  Boundaries were drawn in such a manner
 that each economic area had certain significant characteristics which
 distinguished it from adjoining areas.  There are 510 SEA's.

 SEA's are identified in census tabulations on computer tape by a 2-digit
 numeric code or a 1-digit alphabetic code, assigned sequentially within the
 State; however, no 1980 data are tabulated for SEA's.

 Historical comparability:  SEA boundaries have remained largely unchanged
 since they were defined in 1950.  In 1950, 501 areas were defined; in 1960,
 509; and in 1970, 510.

 See also:  ECONOMIC SUBREGION (ESR).

 TENURE.  The classification of all occupied units as either owner-occupied
 or renter-occupied.  This item was asked on a complete-count basis.

     Owner-occupied.  A housing unit is "owner occupied" if the owner or
     co-owner lives in the unit even if the unit is mortgaged or not fully
     paid for.

     Renter-occupied.  All occupied housing units which are not
     owner-occupied, regardless of whether or not cash rent is paid by a
     member of the household.  ("No cash rent" units, a subcategory of
     renter-occupied, are separately identified in rent tabulations.  Such
     units are generally provided free by friends or relatives, or in
     exchange for the services of, for example, a caretaker, minister, tenant
     farmer, or sharecropper.)

 Historical comparability:  Tenure has been collected since 1890.  In 1970,
 the question on tenure also included a category for condominium and
 cooperative ownership.  In 1980, condominiums are identified in a separate
 question.

 TOWN/TOWNSHIP.  See MINOR CIVIL DIVISION.

 TRACT.  See CENSUS TRACT.

 UNITED STATES.  This designation includes the 50 States and the District of
 Columbia.  STF's and most report series (usually in a separate U.S. Summary
 report) provide data summarized for the United States.

 URBAN AND RURAL (POPULATION).  Urban and rural are type-of-area concepts
 rather than specific areas outlined on maps.  As defined by the Census
 Bureau, the urban population comprises all persons living in urbanized areas
 (UA's) and in places of 2,500 or more inhabitants outside UA's.

 The rural population consists of everyone else.  Therefore, a rural
 classification need not imply farm residence or a sparsely settled area,
 since a small city or town is rural as long as it is outside a UA and has
 fewer than 2,500 inhabitants.

 The terms urban and rural are independent of metropolitan and
 nonmetropolitan designations; both urban and rural areas occur inside and
 outside SMSA's.

 Historical comparability:  Except for the minor relaxation of UA criteria
 discussed below, urban and rural definitions have been consistent since
 1950.  Within small counties, measurements of urban and rural populations
 over time may be significantly affected by the increase or decrease of a
 place's population across the 2,500 population threshold, e.g., the increase
 of 1 person to a place of 2,499 results in an increase of 2,500 to the
 county's urban population.

 URBAN FRINGE.  See URBANIZED AREA.

 URBANIZED AREA (UA).  A population concentration of at least 50,000
 inhabitants, generally consisting of a central city and the surrounding,
 closely settled, contiguous territory (suburbs).

 The UA criteria define a boundary based primarily on a population density of
 at least 1,000 persons per square mile, but also include some less densely
 settled areas within corporate limits, and such areas as industrial parks
 and railroad yards, if they are within areas of dense urban development.
 The density level of 1,000 persons per square mile corresponds approximately
 to the continuously built-up area around a city.  The "urban fringe" is that
 part of the UA outside of a central city.

 Typically, an entire UA is included within an SMSA.  The SMSA is usually
 much larger in terms of territory covered and includes territory where the
 population density is less than 1,000.  Occasionally, more than one UA is
 located within an SMSA.  In some cases a small part of a UA may extend
 beyond an SMSA boundary and possibly into an adjacent SMSA.  A few 1980 UA's
 will be defined in areas which do not meet the criteria for SMSA
 designation.  UA's may cross State boundaries.  In a few cases, a UA does
 not include all of an "extended" city, that is, a city which is determined
 to have a significant amount of rural territory.

 UA's are identified by 4-digit codes, which follow the alphabetic sequence
 of all UA names.  When a UA has the same name as an SMSA, the UA code is the
 same as the SMSA code.  UA boundaries are shown on final MMS/VMS maps, and
 at much smaller scale on UA outline maps in PC80-1-A and HC80-1-A reports.

 Historical comparability:  Because UA's are defined on the basis of
 population distribution at the time of a decennial census, their boundaries
 tend to change following each census to include expanding urban development.

 The criteria have been fairly constant since 1950, although in each decade
 some new refinements have been added.  For the 1970 census, in which 252
 UA's were recognized, it was necessary for the central city to have a
 population of 50,000 or more, or for there to be "twin cities" with a
 combined population of 50,000 and with the smaller city having at least
 15,000.  In 1974, the criteria were liberalized to allow UA recognition to
 certain cities between 25,000 and 50,000, and this resulted in 27 new
 urbanized areas.  For 1980, no minimum population size is required for a
 central city.

 WARD.  Political subdivision of a city used for voting and representation
 purposes.  For 1980, in approximately 900 places of 10,000 inhabitants or
 more and approximately 300 nonblock-numbered places, ward boundaries were
 observed in the definition of enumeration districts (ED's).  For these
 areas, users may prepare ward data by summarizing ED data.  In areas with
 block statistics, users may prepare ward data by summarizing block data.

 Historical comparability:  Population counts for wards in places with a
 population of 10,000 or more appeared in Supplementary Reports, PC-S1, in
 1960 and 1970.

 WHITE POPULATION.  See RACE.
GEOGRAPHIC COVERAGE WITHIN SUMMARY LEVEL

                    GEOGRAPHIC COVERAGE WITHIN SUMMARY LEVEL

      CENSUS OF POPULATION AND HOUSING, 1980 - MASTER AREA REFERENCE FILE
                                    (MARF 2)
                               GEOGRAPHIC CONTENT

                                              State   County   MCD/CCD   Place
 FILE IDENTIFICATION                     (5)   A/N     A/N       A/N      A/N
 RECORD TYPE                             (4)
 SUMMARY LEVEL                           (2)   04       11        12       13
 URBAN AND RURAL COMPONENT               (2)
 INSIDE AND OUTSIDE SMSA'S COMPONENT     (2)
 RACE/SPANISH ORIGIN GROUP               (2)
 ANCESTRY GROUP                          (3)
 BLOCKED PORTION INDICATOR               (1)
 FUNCTIONAL STATUS CODE                  (1)   A       A         A        A
 CONSTITUTION INDICATOR                  (1)   N/V     N/V       N/V      N/V
 COUNTY-PART INDICATOR (NEW ENGLAND)     (1)           N/V
 REGION                                  (1)   N       N         N        N
 DIVISION                                (1)   N       N         N        N
 STATE                                   (2)   N       N         N        N
 FEDERAL INFORMATION PROCESSING
   STANDARD (FIPS) STATE                 (2)   N       N         N        N
 FIPS STANDARD METROPOLITAN
   STATISTICAL AREA (SMSA) 1/            (4)           N/V       N/V      N/V
 FIPS COUNTY                             (3)           N         N        N
 MINOR CIVIL DIVISION/CENSUS
   COUNTY DIVISION (MCD/CCD)             (3)                     N        N
 PLACE  2/  4/                           (4)                              N
 TRACT OR BLOCK NUMBERING AREA
   (BNA) 2/ 5/                           (6)
 BLOCK GROUP                             (1)
 BLOCK                                   (3)
 PLACE - PART INDICATOR 4/               (1)                              N
 TRACT - PART INDICATOR 5/               (1)
 BLOCK - PART INDICATOR                  (1)
 ENUMERATION DISTRICT (ED)
   INDICATOR (PREFIX) 3/                 (1)
 ED NUMBER                               (4)
 ED SUFFIX                               (1)
 FIPS STANDARD CONSOLIDATED
   STATISTICAL AREA (SCSA) 1/            (2)           N/V       N/V      N/V
 URBANIZED AREA (UA)                     (4)
 CONGRESSIONAL DISTRICT (CD)             (2)
 INDIAN RESERVATION/ALASKAN
   NATIVE VILLAGE (ANV)                  (3)
 MCD SEQUENCE NUMBER                     (4)                     N/V      N/V
 WARD                                    (2)
 STATE ECONOMIC AREA (SEA)               (2)           A/N       A/N      A/N
 ECONOMIC SUB-REGION (ESR)               (3)           N         N        N
 DISTRICT OFFICE 2/                      (4)   N       N         N        N
 RECORD SEQUENCE IDENTIFICATION          (4)   N       N         N        N

 SMSA SIZE 1/                            (1)           N/V       N        N
 UA TYPE                                 (1)
 UA SIZE                                 (1)
 PLACE DESCRIPTION 4/                    (1)                              A/N
 PLACE SIZE 4/                           (2)                              N
 EXTENDED CITY INDICATOR                 (1)                              A/N
 CENTRAL BUSINESS DISTRICT (CBD)         (1)
 MCD/CCD SIZE                            (2)                     N        N
 INDIAN SUBRESERVATION                   (3)
 FIPS PLACE                              (5)                     N        N
 STANDARD FEDERAL ADMINISTRATIVE
   REGION (SFAR)                         (2)   N       N         N        N
 LONGITUDE                               (7)   N       N         N        N
 LATITUDE                                (6)   N       N         N        N
 LAND AREA 6/                            (9)   N       N         N        N
 AREA NAME                              (10)   A       A         A        A
 SUPPRESSION FLAGS                      (48)   N       N         N        N


 1/  Code is blank for summary level 11 in New England States.

 2/  Either present as a true code or all '9's wherever indicated.

 3/  Only code A and N are shown, if applicable, for summary level 15.

 4/  This code will not be present on summary level 14, 15 or 16 if the
     summary level 13 has been eliminated as a redundant 'remainder' record.

 5/  This code will not be present on summary level 16 if the summary level
     14 has been eliminated as a redundant 'remainder' record.

 6/  Provided only for county subdivisions with 2,500 or more population.

 A   = Alphabetic code
 N   = Numeric code
 A/N = Alphanumeric code
 V   = Code sometimes does not appear

                    GEOGRAPHIC COVERAGE WITHIN SUMMARY LEVEL
                                  (CONTINUED)

      CENSUS OF POPULATION AND HOUSING, 1980 - MASTER AREA REFERENCE FILE
                                    (MARF 2)
                               GEOGRAPHIC CONTENT

                                                  Tract         BG        ED
 FILE IDENTIFICATION                        (5)    A/N         A/N       A/N
 RECORD TYPE                                (4)
 SUMMARY LEVEL                              (2)    14          15        16
 URBAN AND RURAL COMPONENT                  (2)                N         N
 INSIDE AND OUTSIDE SMSA'S COMPONENT        (2)
 RACE/SPANISH ORIGIN GROUP                  (2)
 ANCESTRY GROUP                             (3)
 BLOCKED PORTION INDICATOR                  (1)
 FUNCTIONAL STATUS CODE                     (1)    A           A         A
 CONSTITUTION INDICATOR                     (1)    N/V         N/V       N/V
 COUNTY-PART INDICATOR (NEW ENGLAND)        (1)
 REGION                                     (1)    N           N         N
 DIVISION                                   (1)    N           N         N
 STATE                                      (2)    N           N         N
 FEDERAL INFORMATION PROCESSING
   STANDARD (FIPS) STATE                    (2)    N           N         N
 FIPS STANDARD METROPOLITAN
   STATISTICAL AREA (SMSA) 1/               (4)    N/V         N/V       N/V
 FIPS COUNTY                                (3)    N           N         N
 MINOR CIVIL DIVISION/CENSUS
   COUNTY DIVISION (MCD/CCD)                (3)    N           N         N
 PLACE  2/  4/                              (4)    N/V         N/V       N/V
 TRACT OR BLOCK NUMBERING AREA
   (BNA) 2/ 5/                              (4)    N           N         N/V
 BLOCK GROUP                                (1)                N
 BLOCK                                      (3)
 PLACE - PART INDICATOR 4/                  (1)    N/V         N/V       N/V
 TRACT - PART INDICATOR 5/                  (1)    N           N         N/V
 BLOCK - PART INDICATOR                     (1)
 ENUMERATION DISTRICT (ED)
   INDICATOR (PREFIX) 3/                    (1)                A/V       A/V
 ED NUMBER                                  (4)                          N
 ED SUFFIX                                  (1)                          A/V
 FIPS STANDARD CONSOLIDATED
   STATISTICAL AREA (SCSA) 1/               (2)    N/V         N/V       N/V
 URBANIZED AREA (UA)                        (4)                N/V       N/V
 CONGRESSIONAL DISTRICT (CD)                (2)                N         N
 INDIAN RESERVATION/ALASKAN
   NATIVE VILLAGE (ANV)                     (3)                N/V       N/V
 MCD SEQUENCE NUMBER                        (4)    N/V         N/V       N/V

 WARD                                       (2)                N/V       N/V
 STATE ECONOMIC AREA (SEA)                  (2)    A/N         A/N       A/N
 ECONOMIC SUB-REGION (ESR)                  (3)    N           N         N

                    GEOGRAPHIC COVERAGE WITHIN SUMMARY LEVEL
                                  (CONTINUED)

      CENSUS OF POPULATION AND HOUSING, 1980 - MASTER AREA REFERENCE FILE
                                    (MARF 2)
                               GEOGRAPHIC CONTENT

                                                  Tract         BG        ED
 DISTRICT OFFICE 2/                         (4)    N           N         N
 RECORD SEQUENCE IDENTIFICATION             (4)    N           N         N

 SMSA SIZE 1/                               (1)    N           N         N
 UA TYPE                                    (1)                N         N
 UA SIZE                                    (1)                N         N
 PLACE DESCRIPTION 4/                       (1)    A/N/V       A/N/V     A/N/V
 PLACE SIZE 4/                              (2)    N/V         N/V       N/V
 EXTENDED CITY INDICATOR                    (1)    A/V         A/V       A/V
 CENTRAL BUSINESS DISTRICT (CBD)            (1)    A/V         A/V       A/V
 MCD/CCD SIZE                               (2)    N           N         N
 INDIAN SUBRESERVATION                      (3)                N/V       N/V
 FIPS PLACE                                 (5)    N/V         N/V       N/V
 STANDARD FEDERAL ADMINISTRATIVE
   REGION (SFAR)                            (2)    N           N         N
 LONGITUDE                                  (7)    N           N         N
 LATITUDE                                   (6)    N           N         N
 LAND AREA 6/                               (9)
 AREA NAME                                 (10)    A           A         A
 SUPPRESSION FLAGS                         (48)    N           N         N


 1/  Code is blank for summary level 11 in New England States.

 2/  Either present as a true code or all '9's wherever indicated.

 3/  Only code A and N are shown, if applicable, for summary level 15.

 4/  This code will not be present on summary level 14, 15 or 16 if the
     summary level 13 has been eliminated as a redundant 'remainder' record.

 5/  This code will not be present on summary level 16 if the summary level
     14 has been eliminated as a redundant 'remainder' record.

 6/  Provided only for county subdivisions with 2,500 or more population.

 A   = Alphabetic code
 N   = Numeric code
 A/N = Alphanumeric code
 V   = Code sometimes does not appear



This page last reviewed: Thursday, January 28, 2016
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