Documentation: Census 1980
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Publisher: U.S. Census Bureau
Survey: Census 1980
Document: Summary Tape File 1
citation:
Social Explorer, U.S. Census Bureau; Census of Population and Housing, 1980 [United States]: Summary Tape File 1a [Computer file]. ICPSR version. Washington, DC: U.S. Dept. of Commerce, Bureau of the Census [producer], 1982. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2002.
Chapter Contents
Summary Tape File 1
Summary Tape File 1 -- Part I
Part I contains information specific to Summary Tape File 1.

Abstract
Census of Population and Housing, 1980:Summary Tape File 1 [machine-readable data file] / conducted by-the U.S. Bureau of the Census. --Washington: Bureau of the Census [producer and distributor], 1981.

Type of File
Summary statistics.

Universe Description
All persons and housing units in the United States.

Subject Matter Description
This file contains complete-count data. Population items tabulated include age, race (provisional data), sex, marital status, Spanish origin (provisional data), household type, and household relationship. Housing items tabulated include occupancy/vacancy status, tenure, contract rent, value, condominium status, number of rooms, and plumbing facilities. Selected aggregates, means, and medians are also provided. Data are presented in 59 tables consisting of 321 cells.

STF 1A, STF 1B, and STF 1C have identical tables and format. They differ only in geographic coverage.

Geographic Coverage
This abstract provides general information about the geographic coverage of STF 1. For detailed information about hierarchy and splits across higher levels of geography, see the section "File Structure and Geographic Coverage."

File A of STF 1 provides summaries 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/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. These summaries are provided in hierarchical sequence. Summaries are also presented on File A for places and congressional districts. (1980 congressional district data presented in STF 1 is for districts delineated for the 96th Congress.)

File B provides summaries in hierarchical sequence for States, standard metropolitan statistical areas (SMSA's), nonSMSA remainder of State, counties, minor civil divisions (MCD's) within counties (available for 20 specified States), places within MCD's within counties (20 specified States) or places within counties (remaining 30 States), census tracts or block numbering areas (BNA's), and blocks or, for nonblock-numbered areas, enumeration districts (ED's). Data for SMSA's which cross State lines are shown only for that portion in the particular State-file. Summaries are also provided for partially block numbered portions of all geographic levels.

File C is also referred to as the National file. It has summaries for the following geographic levels: United States, census regions, census divisions, States, standard consolidated statistical areas (SCSA's), standard areas (SMSA'S), metropolitan statistical and urbanized areas (UA's). SCSA's, SMSA's, and UA'S which cross state lines also have a record for the SCSA, SMSA, or UA portion within each State. Summaries are included for counties, places of 10,000 or more population, MCDs of10,000 or more population in eleven selected States, and congressional districts.Puerto Rico and other outlying areas are excluded from File C.

Technical Description
File Size
STF 1A and STF 1B each comprise one file per State. STF 1C will be a single file for the Nation. Each file has a logical record length of 3276 characters with two record segments of 1638 characters each. The block size for the files varies with user specifications. A printout listing the block size and block count will be sent with each file.

File Sort Sequence
This file is sorted by level of geographic hierarchy. For a complete explanation, see the "File Structure and Geographic Coverage" section.

Reference Materials
U.S. Bureau of the Census. "Census of Population and Housing, 1980: Summary Tape File 1 Technical Documentation" (this document). The documentation includes this abstract as well as additional information about the file and a data dictionary. One copy accompanies each file order when ordered separately; it is available for $5.00 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 SMSA areas 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 "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. For a more detailed discussion on county maps, see the section, "1980 Census Maps."

Place Maps
Place maps are used for places not shown on MMS/VMS where most of the development is contained within the corporate limits of a municipality or within boundaries established for a census designated place (CDP). For a more detailed discussion on place maps, see the section, "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) 449- 1600.

1980 Census Users' Guide
This publication is a comprehensive guide to 1980 census data. It covers 1980 census subject content, procedures, geography, and statistical products. Appendices include a glossary, summaries of the contents of specific tape files, and a glossary, summaries of the contents of specific tape files, and a variety of reference lists. The Users' Guide will be available in late 1981 from the Government Printing Office. Price has not yet been determined as of July 1981.

Monthly Product Announcement (MPA)
New Census Bureau products released each month are listed 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 which are currently available or will be released. For a complete listing, see the 1980 Census Users' Guide.

PHC80(V) Advance Reports
These reports contain population and housing unit counts from the 1970 and 1980 censuses and provisional 1980 race and Spanish/Hispanic origin counts. The set consists of 56 reports in leaflet form including a U.S. Summary and one report for each State, the District of Columbia, Puerto Rico, Guam, Virgin Islands, and American Samoa.

The reports show 1970 and 1980 population and housing unit counts and 1980 provisional counts for five racial categories and Spanish/Hispanic origin for the following areas or their equivalents: State, counties, county subdivisions, incorporated places and congressional districts delineated for the 96th Congress. The U.S. Summary report presents the same data for the United States, its regions, divisions, States, SMSA's, and congressional districts for the 96th Congress. The 1980 census figures presented in STF 1 may differ from those shown in the Advance Reports, PHC80-V. The changes reflect corrections of errors found after PHC80-V- reports were prepared. The changes may affect any geographic area in this file. They are available from Data User Services Division, Customer Services (Publications), Bureau of the Census, Washington, D.C. 20233. Prices of reports vary.

PHC80-1 Block Statistics
(Microfiche report). Data provided are derived from STF 1 and include final population and housing count totals and statistics for selected characteristics based on responses to questions asked of all persons. Data are shown for individual blocks in the blocked portion of each standard metropolitan statistical area (SMSA), and in some cases for blocks in areas adjacent to urbanized areas, for places of 10,000 or more inhabitants, and for areas which contracted with the Census Bureau to provide block statistics. There is one title for each SMSA for block-numbered areas within the SMSA, and one title for each State for block-numbered areas outside of SMSA's. Maps provided with the block reports will be printed on paper stock and will not be available on microfiche. Block reports and maps will be available from the U.S. Government Printing Office, Washington, D.C. 20402.

PHC80-2 Census Tracts
(Microfiche report).Data for selected population and housing-subjects included in the 1980 census are shown by census tracts for standard metropolitan statistical areas (SMSA's), central cities, and places of 10,000 or more inhabitants. Some tables are based on 100-percent or complete count tabulations while others are based on sample tabulations. There is one title for each SMSA and one for the tracted balance of each State. Maps provided with the tract reports will be printed on paper stock and will not be available on microfiche. Tract reports and maps will be available from the U.S. Government Printing Office, Washington, D.C. 20402.

PHC80-3 Summary Characteristics for Governmental Units
This publication is derived from STF1 and STF3 and shows selected population and housing statistics based on complete count and sample estimate data for States, SMSA's, counties, minor functioning civil divisions (20 specified States), and incorporated places. There is one report for each State, the District of Columbia, and Puerto Rico. The publication will be available from the U.S. Government Printing Office, Washington, D.C. 20402.

PC80-1-A Number of Inhabitants
These reports are derived from STF 1 and contain final population counts for States, standard consolidated statistical areas (SCSA's), statistical areas (SMSA's), urbanized standard metropolitan areas (UA's), urban and rural residence, counties, county subdivisions, incorporated places, and census designated places. Reports are issued separately for the United States, each State, the District of Columbia, Puerto Rico, Guam, Virgin Islands, and American Samoa. A combined report will be available for the Pacific Islands and the Northern Mariana Islands. These reports will be available from the U.S. Government Printing Office, Washington, D.C. 20402.

PC80-S1 Supplementary Reports
These reports will be released on a flow basis. The following reports have been issued as of June 1981: "Age, Sex, Race, and Spanish Origin of the Population by Regions, Divisions, and States: 1980" (GPO Stock No. 003-024- 03129-9. Price--$1.50) and "Population and Households by States and Counties: 1980 (GPO Stock No. 003-024-03130-2. Price-- $2.00). They are available from the U.S. Government Printing Office, Washington, D.C. 20402.

Related Machine-Readable Files and Microfiche
Listed below are some of the 1980 census data files which have been or will be released.

Summary Tape Files (STF's) 2-5
These files present data from the 1980 census. STF 2 has subject items collected on a 100-percent basis. STF's 3 through 5 are based on sample data inflated to represent the total population. Files vary in terms of geographic summary levels and amount of detail.

Census of Population and Housing, 1980 -Master Area Reference File (MARF)
This file contains numeric codes and names (where appropriate) of geographic areas plus selected population and housing counts.

Census of Population and Housing, 1980--P.L. 94-171 Population Counts
This file provides counts 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, remainders 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 of the P.L. 94-171 Population Counts file is also available.

File Structure and Geographic Coverage
For each geographic area there will be a 3276-character census logical record. The census logical record is divided into two 1638- character record segments to conform with ASCII standards. Each segment is identified in positions 99-100. The first 102 characters on each record segment provide geographic identification (positions 1 through 102 and 1639 through 1740). The next 150 characters (positions 103 through 252) on the first segment provide additional geographic information and the suppression flags. The remaining 1386 characters on the first segment (positions 253 through 1638) and the remaining 1536 characters on the second segment (positions 1741 through 3276) provide the data for the 59 tables on STF 1. For a concise description of the geographic coverage of each file in STF 1, see Appendix A.



File STF 1A
This file contains summary level data which follow a geographic hierarchy. In File A, block groups (BG's) or enumeration districts (ED's) are nested within a tract, block numbering area (BNA), or-tract/BNA segment which in turn is sequenced within a place, then within a minor division (CCD), place segment, civil division (MCD) or census county remainder of MCD or remainder of CCD, and within a county or county equivalent. Data summaries are presented at each level. When a level of geography is split across the next higher level, only the portion within the higher level will be shown on the summary. For example, if tract 0001 is split between place 0005 and 0010, the summary for the portion in place 0005 will appear in the hierarchy with the place 0005 summaries while the portion in place 0010 will appear with the place 0010 summaries.

Place 0005
  Tract 0001 (part)
    : Block group 1
    : Block group 2
    Tract n
Place 0010
  Tract 0001 (part)
    Block group 3.

In addition, place and congressional district summaries are presented separately from the hierarchically organized summaries. Each summary is identified by a summary level code in positions 10-11 of the record as well as at the beginning of each segment. Figure 1 outlines the specific geographic hierarchy in STF 1A. Each indentation indicates the next lower level of the geographic hierarchy. Following Figure 1 is a discussion of each summary level in the hierarchy.

Figure 1. Geographic Hierarchy of STF 1A

State or State equivalent
   County or county equivalent
       Minor civil division/census county division (MCD/CCD)
           Place or place segment of MCD/CCD within MCD/CCD or remainder
               Census tract or block numbering area (BNA) or untracted segment, within place, place segment, or remainder of MCD/CCD
                   Block group (BG) or BG segment or
                       Enumeration district (ED)
Place
Congressional district

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 an MCD/CCD in 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.The combination of census tract/block numbering area (BNA) or untracted remainder of MCD/CCD (Summary Level 14), and block group (BG) (Summary Level 15) or enumeration district (ED) (Summary Level 16) summaries will vary according to the situation. The four situations are as follows:

Census tract or block numbering area (BNA)/block group (BG)1
When a census tract or BNA is entirely block numbered, a summary is shown for each tract/BNA or tract/BNA portion within MCD/CCD and place, place segment or remainder of MCD/CCD, and for each block group or block group segment within tract/BNA or tract/BNA portion.

Census tract/ED1
When the area is tracted but contains no blocks, a summary is shown for each tract or tract portion within MCD/CCD and place, place segment or remainder of MCD/CCD, and for each ED within tract.1When a tract, block numbering area, or block group crosses a place, MCD, or CCD boundary, there will be separate summaries for the portions within the higher-level entities. No totals for split tracts, BNA's, or block groups are provided.The congressional district summary (Summary Level 33) contains summaries for each congressional district within the State arranged in numeric sequence. These are the congressional districts designated for the 96th Congress.

Not Tracted/ED
When an area is not tracted or not within a BNA, a summary is shown for each ED within the MCD/CCD and place, place segment, or remainder of MCD/CCD. A pseudo-tract code of 999999 will appear in the tract code field.

Census tract/BG-ED1
When a tract is partially block numbered, there will be a mixture of BG and ED summaries for the tract or the tract portion within MCD/CCD and place, place segment or remainder of MCD/CCD. BG summaries will precede those for ED's in this situation.

The place total record (Summary Level 27) provides a summary for each place within the State. The place records are arranged by census place code.


Footnote:
1When a tract, block numbering area, or block group crosses a place, MCD, or CCD boundary, there will be separate summaries for the portions within the higher-level entities. No totals for split tracts, BNA's, or block groups are provided.The congressional district summary (Summary Level 33) contains summaries for each congressional district within the State arranged in numeric sequence. These are the congressional districts designated for the 96th Congress.

File STF 1B
As with STF 1A, each logical-record segment of STF 1B is identified by a summary level code in positions 10-11 of the record. When the level of geography is split across the next higher level, only the portion within the higher level of geography will be shown. (See example on STF 1A description above.) The geographic hierarchy for STF 1B appears in Figure 2.

Figure 2. Geographic Hierarchy of STF 1B

State or State equivalent
* State (block-numbered portion)
SMSA
* SMSA (block-numbered portion)
Remainder of State (nonSMSA)
* Remainder of State (block-numbered portion)
County or County Segment (in New England)
* County (block-numbered portion)
MCD (present only in 20 States)
* MCD (block-numbered portion)Place or place segment within county or MCD (depending on State)
Remainder of MCD or remainder of county (depending on State)
* Remainder of MCD or remainder of county (depending on State) (block-numbered portion)
Tract (BNA) or portion of tract (BNA) within place, place segment and remainder of county or MCD
* Tract (BNA) or portion of tract (BNA) within place, place segment and remainder of county or MCD (block-numbered portion)
Block (or ED)
* Blocked-portion record not shown when the geographic area being summarized is completely block-numbered.

The State record (Summary Level 04) contains a summary for the State or State equivalent. It is followed by a record for the portion of the State which is block numbered, unless the entire State is block numbered. The block-numbered portion indicator is in character 21 of both record segments.

The SMSA record (Summary Level 08) is a summary for each SMSA or portion of an SMSA within the State. The records are in ascending FIPS SMSA code sequence. A remainder-of-State record summarizes the area outside of SMSA's within the State. This summary has a pseudo- SMSA code of 95999. A record is also provided for that portion of the SMSA or remainder-of-State which is block numbered. If the entire SMSA or SMSA part within a State is block numbered, the block numbered portion record will not be presented. The indicator for a block-numbered portion record is in character 21 of each record segment.

The county record (Summary Level 17) is a summary for each county, county equivalent (including independent cities), and, in New England, portions of counties. These are arranged in FIPS county code sequence within SMSA; in New England, in census MCD code sequence, within county, within SMSA. NonSMSA summaries will follow the nonSMSA remainder-of-State record. There is also a record for the block-numbered portion of the county, county equivalent, or county part if the entire county is not block-numbered. The indicator for a block-numbered portion record is in character 21 of each record segment.

The MCD summary (Summary Level 18) is provided for the following 20 States:

Connecticut; Illinois; Indiana; Kansas; Maine; Massachusetts; Michigan; Minnesota; Missouri; Nebraska; New Hampshire; New Jersey; New York; North Dakota; Ohio; Pennsylvania; Rhode Island; South Dakota; Vermont; Wisconsin.

The summary is not present in the remaining States. When present, these summaries appear in ascending MCD code sequence within the county. There is also a summary for the block-numbered portion of the MCD for the 20 specified States. If the entire MCD is block numbered, the summary will not be present. The indicator for a block-numbered portion record is in character 21 of each record segment.

The place summary (Summary Level 19) provides a summary for each place segment within an MCD in the 20 States listed above. In the remaining States, a summary is provided for each place or place segment within a county (Summary Level 23). If place or place segment summaries are present for a given MCD or county, a summary is also presented for geographic areas outside the place reflecting either remainder-of -MCD or remainder-of-county, depending on the State being processed. These will have a pseudo-place code of 9999. These summaries are in ascending census place code sequence within the applicable area. A summary is also provided for the block numbered portion of the remainder-of-MCD and remainder-of-county area if the entire area is not block numbered. The indicator for a block numbered portion record is in character 21 of each record segment.

The tract (BNA) summary (Summary Level 20 for 20 specified States, Summary Level 24 for the remaining States) is a summary for all of a tract or the portion of the tract within the place, place segment or remainder of MCD or county. Areas which are not tracted have a pseudo-tract summary with a code of 999999. A summary is also provided for the portion of the tract which is block numbered. This summary is not shown when the entire tract is block numbered. The indicator of a block numbered portion record is in character 21 of each record segment. Where a tract (BNA) crosses a place or, in 20 specified States, MCD boundary, separate summaries pertain to each tract-part within the higher level entity. There are no total records for split tracts or BNA'S.

The block summary (Summary Level 21 for 20 specified States, SummaryLevel 25 for the remaining States) provides data for each block within the tract. When a block crosses a place or, in 20 specified States, an MCD boundary, separate summaries are provided for each block part.

The enumeration district (ED) summary (Summary Level 22 for 20 specified States, Summary Level 26 for the remaining States) is generated if there are no blocks within an area or portion of an area.

File STF 1C
This file is essentially a national file which will be issued only after STF's 1A and 1B have been released for all States. The geographic hierarchy for this file is shown in Figure 3 below.

Figure 3. Geographic Hierarchy of STF 1C

United States
Region
Division
State or State equivalent
SCSA
   SCSA part within State
SMSA
   SMSA part within State
Urbanized Area
   UA part within State
State-County or county equivalent
State-Places of 10,000+
*State-MCD's of 10,000+
State-Congressional districts

*This summary available for eleven States. See explanation in descriptive section which follows.

  • The United States summary (Summary Level 01) provides a summary for the United States. (50 States and the District of Columbia).
  • The region summary (Summary Level 02) has a summary for each of the four census regions in the United States.
  • The division summary (Summary Level 03) has a summary for each of nine census divisions in the United States.
  • The State summary (Summary Level 04) has a summary for each State or State equivalent in ascending FIPS State code sequence.
  • The standard consolidated statistical area (SCSA) summary (Summary Level 05) has a summary for each SCSA in the United States in ascending SCSA sequence.
  • The SCSA/State summary (Summary Level 06) will be a summary for the portion of the SCSA in each State in which a multi-State SCSA is located. These are arranged in ascending FIPS State code within SCSA sequence.
  • The standard metropolitan statistical area (SMSA) summary (SummaryLevel 07) provides a summary for each SMSA in the United States in ascending SMSA sequence.
  • The SMSA/State summary (Summary Level 08) provides a summary for the portion of the SMSA in each State in which a multi-State SMSA is located. These summaries are arranged in ascending FIPS State code within SMSA sequence.
  • The urbanized area (UA) summary (Summary Level 09) contains a summary for each UA in the United States in ascending UA code sequence.
  • The UA/State summary (Summary Level 10) provides data for the portion of the UA in each State in which the multi-State UA is located. These are in ascending FIPS State code within UA sequence.
  • The State/county summary (Summary Level 11) provides a summary for each county or county equivalent, including independent cities, in the United States. These are arranged by FIPS State code by FIPS county code.
  • The State/place summary (Summary Level 27) provides a summary for all places of 10,000 or more population within the United States. These are arranged by FIPS State Code by census place code.
  • The State/MCD summary (Summary Level 28) provides a summary for MCD's of 10,000 or more population within 11 States. The sequence is FIPS State code by MCD sequence number. The 4-digit MCD number differs from the 3-digit MCD code by identifying MCD's in alphabetic order within State. The 11 States are as follows:

Connecticut; Maine; Massachusetts; Michigan; New Hampshire; New Jersey; New York; Pennsylvania; Rhode Island; Vermont; Wisconsin.

The congressional district summary (Summary level 33) contains a summary for each congressional district in the United States in FIPS State code by congressional district number sequence.

Calculation of Medians in STF 1
Calculations of median values are done assuming a continuous distribution with the whole number as the mid-point of the class interval. Figure 4 below lists the class interval definitions for each variable in STF 1 which has a median calculated.

Figure 4. Class Intervals for Computation of Median for Variables in STF 1

I. Age Lower Limit Upper Limit
Under 1 year 0 1.01
1 and 2 years 1.0 3.0
3 and 4 years 3.0 5.0
5 years 5.0 6.0
6 years 6.0 7.0
7 to 9 years 7.0 10.0
10 to 13 years 10.0 14.0
14 years 14.0 15.0
15 years 15.0 16.0
16 years 16.0 17.0
17 years 17.0 18.0
18 years 18.0 19.0
19 years 19.0 20.0
20' years 20.0 21.0
21 years 21.0 22.0
22 to 24 years 22.0 25.0
25 to 29 years 25.0 30.0
30 to 34 years 30.0 35.0
35 to 44 years 35.0 45.0
45 to 54 years 45.0 55.0
55 to 59 years 55.0 60.0
60 to 61 years 60.0 62.0
62 to 64 years 62.0 65.0
65 to 74 years 65.0 75.0
75 to 84 years 75.0 85.0
85 years and over 85.0 113.0 2
II. Rooms
1 room 0.5 1.5 3
2 rooms 1 .5 2.5
3 rooms 2.5 3.5
4 rooms 3.5 4.5
5 rooms 4.5 5.5
6 or more rooms 5.5 9.94
III. Persons in Unit
1 person 0.5 1.55
2 persons 1.5 2.5
3 persons 2.5 3.5
4 persons 3.5 4.5
5 persons 4.5 5.5
6 or more persons 5.5 9.96
IV. Value
Less than $10,000 0 10,000
$10,000 to $14,999 10,000 15,000
$15,000 to $19,999 15,000 20,000
$20,000 to $24,999 20,000 25,000
$25,000 to $29,999 25,000 30,000
$30,000 to $34,999 30,000 35,000
$35,000 to $39,999 35,000 40,000
$40,000 to $49,999 40,000 50,000
$50,000 to $79,999 50,000 80,000
$80,000 to $99,999 80,000 100,000
$100,000 to $149,999 100,000 150,000
$150,000 to $199,999 150,000 200,000
$200,000 or more 200,000 250,000
V. Contract Rent
Less than $50 0 509
$50 to $99 50 100
$100 to $119 100 120
$120 to 5139 120 140
$140 to $149 140 150
$150 to $159 150 160
$160 to $169 160 170
$170 to $199 170 200
$200 to $249 200 250
$250 to $299 250 300
$300 to $399 300 400
$400 to $499 400 500
$500 or more 500 55010


Footnotes:
1If a median age is less than 1.0, the cell will be set to 000000009.
2If a median age is over 85.0, the cell will be set to 000000851.
3If median rooms is less than 1.1; the cell will be set to 000000010.
4If median rooms is over 5.5, the cell will be set to 000000056.
5If median number of persons in unit is less than 1.01, the cell will be set to 000000100.
6If median number of persons in unit is over 5.50, the cell will be set to 000000551.
7If median value is less than 10,000, the cell will be set to 000009900.
8If median value is more than 200,000, the cell will be set to 000200100.
9If median contract rent is less than 50, the cell will be set to 000000049.
10If median contract rent is more than 500, the cell will be set to 000000501.


Suppression
In order to maintain the confidentiality promised respondents and required by law, it is necessary for -the Census Bureau to make sure that its public data, in print or on tape, do not disclose information about any individual. Therefore, the Bureau suppresses tabulations of characteristics of very small groups of people or housing units. On summary tapes, zeroes are entered in suppressed cells and flag fields which indicate suppression are shown on each record. However, a zero in a cell does not automatically mean suppression. Only by checking the suppression flag can it be determined if the zero in a specific table is suppressed data or an actual count of zero.

This discussion outlines the rules for suppression of 100-percent data, how its occurrence can be identified by the user, and how to handle it.

No Suppression
Several basic counts are never suppressed, even if there is a count of only one. They are as follows:

Total population
Total housing units
Year-round housing units
Occupied units
Vacant year-round housing units
Count of persons and households in each race or Spanish origin group

Primary Suppression
Suppression of Population Characteristics
Characteristics of persons other than race or Spanish origin (e.g., age, relationship) are shown only if there are 1S or more persons in the geographic area. For example, on a record for an enumeration district with a population of 1 to 14 persons, population characteristics such as we and relationship are suppressed. Only counts for total population and the number of persons within specific race or Spanish origin groups are provided.

However, when the geographic area being summarized has 15 or more persons, no suppression of population characteristics will occur-- except possibly when tables are cross-classified by race or Spanish origin. The rules for this type of suppression are outlined below in Suppression of Tables Cross-Classified by Race or Spanish Origin.

Suppression Year-round Housing Characteristics
Characteristics of year-round housing units which are not classified by occupancy status (e.g., number of rooms, plumbing facilities, etc.) are suppressed only when there are fewer than five year-round housing units in the geographic area being tabulated regardless of the number of occupied housing units or the number of persons. See Figure 6.





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

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

Suppression of Tables Cross-Classified by Race or Spanish Origin
Population and housing characteristics cross-classified by race or Spanish origin are subject to an additional level of scrutiny. On this level the 15 person or five household criteria stated above are also applied to each race or Spanish origin category. For example, a table of race by age for a geographic area which has 80 persons - 40 White, 20 Black, 14 American Indian, Eskimo and Aleut, and 6 Asian and Pacific Islanders shows data on age for Whites and Blacks. None of the data for these 2 groups are suppressed since they meet the criteria of having 15 persons of that race or Spanish origin group in the geographic area ("rule of 15). Data for the other two race groups would not be shown.

Individual cells of data for specific race or Spanish origin groups are never suppressed when there are 15 or more persons of that group in a geographic area unless required by complementary suppression (see below). For example, a table on age by race indicating 2 Blacks under 5 years, 10 Blacks 5 to 17 years, 4 Blacks 18 to 64 years, and 4 Blacks 65 years and over is presented since there are 15 or more total Blacks in the geographic area being tabulated.

The population and housing suppression criteria are applied independently of one another. For example, if there are 16 Spanish origin persons but only four households with Spanish origin householders, the person characteristics will be shown but the family, household, and housing characteristics will be suppressed.

Complementary Suppression
In some cases complementary suppression is applied to prevent the derivation of suppressed data by subtraction. For instance, when a table shows the number of persons in unit for all households and also for renters, there must be at least five owners and five renters for the renter data to be shown; otherwise the characteristics of the owners could be derived by subtracting renter data from data for all households.

The following example illustrates complementary suppression as applied to a table of population characteristics cross-classified by race.

Example: This is a hypothetical table of race by age. The first column indicates the actual figures, while the- second column indicates the data as they appear after applying both primary and complementary suppression.

Race by Age (1)Actual (2)Data as made Public
Total:    
Under 5 years 10 10
5 to 17 years 20 20
18 to 64 years 140 140
65 years and over 30 30
White:  
Under 5 years 7 7
5 to 17 years 11 11
18 to 64 years 90 90
65 years and over 16 16
Black:  
Under 5 years 1 0 (s) Primary Suppression
5 to 17 years 1 0 (s)
18 to 64 years 10 0 (s)
65 years and over 2 0 (s)
American Indian, Eskimo and Aleut:  
Under 5 years 2 0 (s) Complementary Suppression
5 to 17 years 8 0 (s)
18 to 64 years 40 0 (s)
65 years and over 12 0 (s)
Asian and Pacific Islander:  
Under 5 years 0 0
5 to 17 years 0 0
18 to 64 years 0 0
65 years and over 0 0
Other:  
Under 5 years 0 0
5 to 17 years 0 0
18 to 64 years 0 0
65 years and over 0 0


Comparing the columns, the actual count (~01. 1) indicates more than 15 persons for both, Whites and American Indians, Eskimos, and Aleuts, less than 15 Blacks, and 0 for both Asian and Pacific Islanders and Other. Since there are fewer than 15 Blacks, data for this group are suppressed. However, since only one race group is suppressed, complementary suppression rules must be applied. Since it would be a simple matter to determine the number of Blacks by subtracting the sum of Whites and American Indians, Eskimos, and Aleuts from the total, it is necessary to suppress the data for American Indians, Eskimos, and Aleuts as well (complementary suppression). Column 2 indicates the figures which would appear with an indication whether suppression is primary or complementary. It should be noted "other" that is the first race category to which complementary suppression is applied if there are persons in that category. This complementary suppression may not always be obvious because many tables do not present data about "other races" directly, but require them to be derived by subtraction.

Examples of Suppression
The following example shows four tables from the STF 1 Data Dictionary. The first table (Table 7) will never be suppressed because it is a basic count. The second table (Table 10) will only be suppressed if there are fewer than 15 persons in the geographic area being summarized. The third table (Table 19) will be suppressed if there are fewer than five occupied housing units in the tabulation area. The fourth table (Table 12) will have portions suppressed for race groups with fewer than 15 members in the geographic area tabulated or if complementary suppression is applied.

Examples: This table has no suppression because a count of persons by race is never suppressed.

Table 7(TAB7) 9 370 370 N 15
  Race (15)
This table has no suppression
Universe: Persons
See Footnote 3 4
TAB7  
(1) 370    White
(2) 379    Black
  American Indian, Eskimo, and Aleut:
(3) 388    American Indian
(4) 397    Eskimo
(5) 406    Aleut
  Asian and Pacific Islander:
(6) 415    Japanese
(7) 424    Chinese
(8) 433    Filipino
(9) 442    Korean
(10) 451    Asian Indian
(11) 460    Vietnamese
(12) 469    Hawaiian
(13) 478    Guamanian
(14) 487    Samoan
(15) 496    Other


This table will be suppressed only when there are 1-14 persons in the geographic area.

Table 10(TAB10) 9 595 595 N 152
  Sex (2) By Age (26)
SUPFLG01 applies to all cells
Universe: Persons
The Stratifiers are Sex By Age
TAB10  
  Total:
(1,1) 595    Under 1 year
(1,2) 604    1 and 2 years
(1,3) 613    3 and 4 years
(1,4) 622    5 years
(1,5) 631    6 years
(1,6) 640    7 to 9 years
(1,7) 649    10 to 13 years
(1,8) 658    14 years
(1,9) 667    15 years
(1,10) 676    16 years
(1,11) 685    17 years
(1,12) 694    18 years
(1,13) 703    19 years
(1,14) 712    20 years
(1,15) 721    21 years
(1,16) 730    22 to 24 years
(1,17) 739    25 to 34 years
(1,18) 748    30 to 34 years
(1,19) 757    35 to 44 years
(1,20) 766    45 to 54 years
(1,21) 775    55 to 59 years
(1,22) 784    60 to 61 years
(1,23) 793    62 to 64 years
(1,24) 802    65 to 74 years
(1,25) 811    75 to 84 years
(1,26) 820    85 years and over
  Female:
(2,1) 829    Under 1 year
(2,2) 838    1 and 2 years
(2,3) 847    3 and 4 years
(2,4) 856    5 years
(2,5) 865    6 years
(2,6) 874    7 to 9 years
(2,7) 883    10 to 13 years
(2,8) 892    14 years
(2,9) 901    15 years
(2,10) 910    16 years
(2,11) 919    17 years
(2,12) 928    18 years
(2,13) 937    19 years
(2,14) 946    20 years
(2,15) 955    21 years
(2,16) 964    22 to 24 years
(2,17) 973    25 to 34 years
(2,18) 982    30 to 34 years
(2,19) 991    35 to 44 years
(2,20) 1000    45 to 54 years
(2,21) 1009    55 to 59 years
(2,22) 1018    60 to 61 years
(2,23) 1027    62 to 64 years
(2,24) 1036    65 to 74 years
(2,25) 1045    75 to 84 years
(2,26) 1054    85 years and over
This table will be suppressed only when there are 1-4 occupied housing units in the area.
Table 19(TAB19) 9 1822 184 N
  Household Type (4)
SUPFLG10 applies to all cells
Universe: Houseeholds With One or More Persons Under 18 Years
TAB19  
(1) 1822    Married-couple family
  Other family:
(2) 1831    Male householder, no wife present
(3) 1840    Female householder, no husband present
(4) 1849    Nonfamily household


The portion of this table indicating total will only be suppressed when there are 1-14 persons in the geographic area.The portion of the table containing summaries for White persons will be suppressed if there are 1-14 White persons in the geographic area, or if complementary suppression is applied. The same rule applies to each race/Spanish origin group.

Table 12(TAB12) 9 1090 1090 N 20
  Race (5) By Age (4)
SUPFLG01 applies to all cells 1-4
SUPFLG02 applies to all cells 5-8
SUPFLG03 applies to all cells 9-12
SUPFLG04 applies to all cells 13-16
SUPFLG05 applies to all cells 17-20
Universe: Persons
See Footnote 4
The Stratifiers are Race By Age
TAB12  
  Total:
(1,1) 1090    Under 5 year
(1,2) 1099    5 to 17 years
(1,3) 1108    18 to 64 years
(1,4) 1117    65 years and over
  White:
(2,1) 1126    Under 5 year
(2,2) 1135    5 to 17 years
(2,3) 1144    18 to 64 years
(2,4) 1153    65 years and over
  Black:
(3,1) 1162    Under 5 year
(3,2) 1171    5 to 17 years
(3,3) 1180    18 to 64 years
(3,4) 1189    65 years and over
  American Indian, Eskimo, and Aleut:
(4,1) 1198    Under 5 year
(4,2) 1207    5 to 17 years
(4,3) 1216    18 to 64 years
(4,4) 1225    65 years and over
  Asian and Pacific Islander:
(5,1) 1234    Under 5 year
(5,2) 1243    5 to 17 years
(5,3) 1252    18 to 64 years
(5,4) 1261    65 years and over


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 tables by checking either the table description or the flag description. Example: The boxed illustration below is the table description as it appears in the data dictionary. The other portion illustrates the suppression flag to which the table description refers.



SUPFLG 1B Renter Occupied Housing Unit Suppression Flag A 1 in this field indicates suppression because there are fewer than five housing units in the renter-occupied category of the geographic area being summarized or complementary suppression is applied. This effects the following tables:

434445(cell 1)

46(cell 1)

0 No suppression

1 Suppression

Figure 7 which follows, lists each suppression flag, its location within the record, and the tables or cells within tables which are affected when suppression is applied. The suppression flag field which applies to each table or portion of a table is also identified the table description in the data dictionary. The flags are located in the geographic identification section of each record segment in positions 205-225.

Figure 7. Suppression Flags

Name Begin Table
SUPFLG01 205 6, 10, 11, 12, (cells 1-4), 14, 15, 17, 18, 20
SUPFLG02 206 12 (cells 5-8)
SUPFLG03 207 12 (cells 9-12)
SUPFLG04 208 12 (cells 13-16)
SUPFLG05 209 12 (cells 17-20)
SUPFLG06 210 13 (1-4)
SUPFLG07 211 13 (cells 5-8)
SUPFLG08 212 13 (cells 9-12)
SUPFLG09 213 29 (cell 1), 30, 31, 32 (cell 1), 47 (cells 1-2), 55
SUPFLG10 214 2, 16, 19, 21, 22, 23, (cells 1-2) 24, 26 (cell 2), 29 (cells 3-4), 32 (cells 3-5), 33 (cells 1-6), 364, 35, 36 (cell 1), 37 (cells 1-3), 47 (cells 3-4), 48 (cell 1), 49 (cell 1), 50, 51
SUPFLG11 215 27 (cell 6)
SUPFLG12 216 27 (cell 7)
SUPFLG13 217 27 (cell 8)
SUPFLG14 218 27 (cell 9)
SUPFLG15 219 27 (cell 10)
SUPFLG16 220 23 (cells 3-4), 29 (cell 2), 32 (cell 2), 33 (cells 7-12), 36 (cell 2), 37 (cells 4-6), 47 (cells 5-6), 48 (cell 2), 49 (cell 2)
SUPFLG17 221 38, 39, 40 (cell 1), 41 (cell 1), 42 (cell 1)
SUPFLG18 222 43, 44, 45 (cell 1), 46 (cell 1)
SUPFLG19 223 28 (cell 4)
SUPFLG20 224 28 (cell 5)
SUPFLG21 225 28 (cell 6)


Evaluating the Effect of Suppression
In most cases, suppressed data values are small (fewer than 5 or 15) except where a large population is affected by complementary suppression. Therefore, in certain noncritical applications, users may simplify programming operations by ignoring suppression and treating suppressed cells as zero cells.However, if the user is adding up blocks or enumeration districts to derive tables for user-defined areas, ignoring suppression can result in a downward bias in the totals. The impact of that downward bias can be gauged by comparing sums associated with tables subject to suppresssion with nonsuppressed sums for the same aggregation of areas. For example, if age data for Blacks from table 12 are added together for a group of blocks, the impact of suppression can be gauged by adding the ages together to get a total, and comparing that number to the number of Blacks derived from summary table 7 for the same group of blocks (table 7 is not subject to suppression).

Data Finder
ITEM Table NUMBER
Age 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 23
Age of Householder 23
Persons 15 Years Old And Over 14
Persons 60 Years Old And Over 21
Persons 65 Years Old And Over 20, 22, 23
Persons Under 18 Years 17, 19
Median Age 11
Aggregate Contract Rent And Rent Asked 45
Aggregate Rooms 32
Aggregate Value And Price Asked (See also: Value) 40,42
Allocations and Substitutions: 59
Allocations (Housing) 57
Allocations (Population) 56
Persons Substituted 58
Year-Round Housing Units Substituted  
Boarded Up (See: Housing Units, Year-Round, Vacant)  
Children (See: Related Children and/or Household Type And Relationship)  
Condominium Housing Units (See: Housing Units, Year-Round)  
Contract Rent (See: Also,Rent Asked) 43, 44
Duration Of Vacancy (See: Housing Units, Year-Round, Vacant)  
Families 2
Household Type (See also: Household Type And Relationship and/or Households With One Or More Nonrelatives Present) 16, 19, 21, 22
Household Type And Relationship (See also: Household Type and/or Households With One Or More Nonrelatives Present) 15, 17, 20
Households (See also: Housing Units, Year-Round: Occupied) 3, 16, 19, 21, 22, 24
Households With One Or More Nonrelatives Present (See also: Household Type And Relationship) 24
Householder Of Spanish Origin (See also: Spanish Origin) 28
Housing Units (Including Vacant Seasonal And Migratory Units) 4
Housing Units, Year-Round 5, 23, 25 thru 55, 58, 59
Occupied and Vacant 5, 29, 30, 31, 32, 40, 41, 42, 45, 46, 47, 55, 58, 59
Condominium 29, 42
Owner-Occupied And Vacant-For-Sale-Only 42
Vacancy Status 29
Specified Owner-Occupied And Vacant- For-Sale-Only Noncondominium 40, 41
Specified Renter-Occupied And Vacant-For-Rent 45, 46
Substituted or Allocated (See: Allocations and Substitutions)  
Occupied 23, 26, 27, 28, 33, 34, 35, 36, 37, 38, 39,43, 44, 48, 49, 50, 51
Specified Owner-Occupied Noncondominium 38, 39
Specified Renter-Occupied 43, 44
Vacant 25, 52, 53, 54
Boarded Up 52
Duration of Vacantcy  
Vacancy: 2 Or More Months 53
Vacant 6 Or More Months 54
Vacant-For-Rent 53
Vacant-For-Sale-Only 54
Vacancy Status 25
Lacking Complete Plumbing Facilities For Exclusive Use (See: Plumbing Facilities)  
Marital Status 14
Median Age (See also: Age) 11
Median Contract Rent (See also: Contract Rent) 44
Median Persons Per Unit (See also: Persons; Persons In Household, Persons In Unit, and/or Persons Per Unit) 34
Median Rooms (See also: Rooms) 31
Median Value (See also: Value) 39
Noncondominium Housing Units (See: Housing Units, Year-Round)  
Occupied Housing Units (See: Housing Units, Year-Round)  
Occupancy Status 5, 40, 41, 45, 46, 47
Owner Occupied (See: Housing Units, Year-Round)  
Paying Cash Rent (See: Contract Rent)  
Persons 1, 6 thru 23, 33 thru 37, 48 thru 51, 56, 57
Persons In Household 16, 21, 22
Persons In Unit 33, 36, 49, 50, 51
Persons Per Unit 34, 35
Persons Per Room 37, 48, 49, 51
1.01 Persons Or More Persons Per Room 48, 49, 51
Persons Of Spanish Origin 8, 9, 51
Related Children 18
Substituted Or Allocated (See: Allocations And Substitutions)  
Plumbing Facilities 47, 48, 50, 51
Lacking Complete Plumbing Facilities 48, 50
Price Asked (See: Aggregate Value And Price Asked and/or Value)  
Race 7, 9, 12, 13, 27, 28
Race of Householder 27, 28
Related Children (See also: Household Type And Relationship) 18
Relationship (See: Household Type And Relationship, Household Type, and/or Households With One Or More Nonrelatives Present)  
Rent (See: Contract Rent, and/or Aggregate Contract Rent And Rent Asked)  
Rent Asked (See also: Contract Rent) 45
Renter Occupied (See: Housing Units, Year-Round)  
Rooms (See also: Persons Per Room and Aggregate Rooms) 30, 31
Rural (See: Urban And Rural)  
Sex 6, 10, 11, 14
Spanish Origin 8, 9, 13
Specified Units (See: Housing Units, Year Round)  
Substituted (See: Allocations and Substitutions)  
Tenure 23, 26, 27, 28, 29, 32, 33, 36, 37, 47, 48, 49
Tenure and Occupancy Status 47
Tenure and Vacancy Status (See also: Housing Units, Year-Round) 29, 32
Units At Address 55
Urban And Rural 1, 4
Vacancy Status (See: Housing Units, Year-Round and/or Tenure and Vacancy Status)  
Value (See also: Aggregate Value And Price Asked) 38, 39
Year-Round Housing Units (See: Housing Units, Year-Round)  


Universe Finder
Universes in STF 1 are defined on the basis of one of the following four characteristics: persons, housing units, households, and families. The universe is indicated on this finder by an 'X'. Universe restrictors are identified with an 'r'. Thus, a user interested in counts of households canQuickly identify which tables should be consulted.

Universe
Table Persons Housing Units Households Families
1 X      
2       X
3     X  
4   X    
5   X    
6 X      
7 X      
8 X      
9 X      
10 X      
11 X      
12 X      
13 X      
14 X      
15 X      
16     X  
17 X      
18 X      
19 r   X  
20 X      
21 r   X  
22 r   X  
23 r X    
24     X  
25   X    
26   X    
27   X    
28 r X    
29   X    
30   X    
31   X    
32   X    
33   X    
34   X    
35   X    
36 X r    
37   X    
38   X    
39   X    
40   X    
41   X    
42   X    
43   X    
44   X    
45   X    
46   X    
47   X    
48 r X    
49 r X    
50 X r    
51 X r    
52   X    
53   X    
54   X    
55   X    
56 X      
57 X      
58   X    
59   X    


Table Outlines
For more information, please refer to: Table Section.pdf

How to Use the Data Dictionary
The data dictionary contains complete information regarding geographic codes, table information, and a detailed table layout. The following is an outline of information provided in both the geographic and table identification portions of the file.

Geographic Identification
The first line of each geographic identification variable gives the name, size/scale, begin position, relative 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 B-character identifier. It may be a mnemonic such as "STATE" or "EDNUMBER", or a sequential identifier such as "TAB 1", "TAB2", etc.
  2. Size/Scale - The size of a data item is given in characters. The scale of a data item is given in powers of 10. Implied decimals or multipliers (in 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 a power of ten are identified in the notes following the description and in the footnotes.
  3. Begin - This is the location in the data record of the first character of the data item.
  4. Relative Begin - This value indicates the beginning location of a data item within the segment files with segmented records. For example, STF 1 has a census logical record length of 3276 characters which is segmented into two segments of 1638 characters each. The data item beginning in position 1639 of the census logical record would have a relative begin value of 1.
  5. Data Type - The data type indicates whether the data item is alphanumeric (A) or numeric (N).
  6. 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.


Table Identification
The documentation of tables begins with the name, size/scale, begin position, relative begin position for the table, data type, and the number of cells. This information is followed by the table title, applicable suppression flags, universe definition, applicable footnotes, stratifier identification, and a listing of the cells. These items are defined below.



Table Title
The title of the table identifies the stratifiers used in the table, and in parentheses following each stratifier the number of categories for that stratifier. For example, this title indicates that there are two categories of tenure and five categories of race of householder identified in the table.

Suppression Flags
This section of the table documentation identifies by name any applicable flags and the cells to which they apply.

Universe
The universe identifies the unit of observation for the table. For example, the cells in this table are counts of occupied housing units.

Footnotes
This section identifies any footnotes, listed at the end of the data dictionary, which apply to the table.

Stratifiers
This section lists the stratifiers used in the table, in the order that they appear on the data tape. For example, this table begins with the first category of tenure cross classified by the five categories of race of householder. This is followed by the second category of tenure cross classified by the five categories of race of householder.

Data Dictionary
For more information, please refer to: Data Dictionary.pdf