This section explains the way the files were published regardless of the access methods as described above.
- Selected Products From the Short Form
Counts reported from the short form represent exact counts as these questions were asked of 100% of the population. They are reported on the following products.
- Summary File 1 (SF1)
Data for all topics tabulated for the nation and by basic race categories and Hispanic/non-Hispanic populations. Note that New York City successfully challenged the SF1 counts for detailed Hispanic Origin and a revised file was issued. The revised file is available in the CU Data Catalog,
- Summary File 2 (SF2)
Data for all topics tabulated for the nation and by detailed race categories and Hispanic/non-Hispanic populations.
- Demographic Profiles (DP1)
Preformatted reports summarizing, for named geographic locations, data reported on the short form. Data are derived from SF1.
- Re-Districting File (PL-94)
Selected topics tabulated for the purpose of congressional reapportionment.
- Selected Products From the Long Form
Counts reported from the long form represent estimated counts based on the large sample of the population who completed the long form. The topics cover those asked on the short form plus a wide range of socio-demographic topics. They are reported on the following products:
- Summary File 3 (SF3)
Data for all topics tabulated for the nation and by basic race categories and Hispanic/non-Hispanic populations.
- Summary File 4 (SF4)
Data for all topics tabulated for the nation for 336 population groups (groups included detailed race and Hispanic origin groups, and selected ancestry).
- Demographic Profiles
Preformatted reports summarizing, for named geographic locations, data reported on the short form. Data are derived from SF3.
- Microdata
The responses from individual questionnaires are released as ASCII file called Public Use Microdata (PUMS) For details about microdata, refer to the Public Use Microdata Sample (PUMS) page.
- PUMS 1%
A sample of 1% of the housing units that filled out the long form questionnaire.
- PUMS 5%
A sample of 5% of the housing units that filled out the long form questionnaire.
- Special Topic Products
These analyses are based on either a subject or geography:
- Worker Flow
- School Districts
- Migration
- Transportation Planning
- Congressional District (has both 100% and sample data)
- Maps and Spatial Data
All the geographies supported by the Census Bureau were originally published in the TIGER® Line Files product. These are the basis for the spatial data products described above.
- Census 2000 Data Products At a Glance
A list of all 2000 Data products with their release date, medium in which they are published, and their geographic coverage.