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.

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

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.

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."

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 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.

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.

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.

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.

(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.

(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.

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.

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.

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.

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.

This file contains numeric codes and names (where appropriate) of geographic areas plus selected population and housing 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.

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:

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.

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.

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

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

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.

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.

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.

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

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

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

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.

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