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2000 Decennial Census Guidance for Data Users

Component ID: #ti763299930

2000 Census Data

Component ID: #ti763299931

Demographic Profiles: 100-percent and Sample Data

A profile includes four tables that provide various demographic, social, economic, and housing characteristics for the United States, states, counties, minor civil divisions in selected states, places, metropolitan areas, American Indian and Alaska Native areas, Hawaiian home lands and congressional districts (106th Congress). It includes 100-percent and sample data from Census 2000.

Component ID: #ti763299929

Summary File 1 (SF1)

Summary File 1 (SF 1) contains 286 detailed tables focusing on age, sex, households, families, and housing units. These tables provide in-depth figures by race and Hispanic origin; some tables are repeated for each of nine race/Latino groups. Counts also are provided for over forty American Indian and Alaska Native tribes and for groups within race categories. The race categories include eighteen Asian groups and twelve Native Hawaiian and Other Pacific Islander groups. Counts of persons of Hispanic origin by country of origin (twenty-eight groups) are also shown.

Summary File 1 presents data for the United States, the 50 states, and the District of Columbia in a hierarchical sequence down to the block level for many tabulations, but only to the census tract level for others. Summaries are included for other geographic areas such as ZIP Code Tabulation Areas (ZCTAs) and Congressional districts.

Geographic coverage for Puerto Rico is comparable to the 50 states. Data are presented in a hierarchical sequence down the block level for many tabulations, but only to the census tract level for others. Geographic areas include barrios, barrios-pueblo, subbarrios, places, census tracts, block groups, and blocks. Summaries also are included for other geographic areas such as ZIP Code Tabulation Areas (ZCTAs).

Summary File 1 detailed tables are identified according to geographic coverage:

  • Population tables (Pn) are available to the block level
  • Housing tables (Hn) available to the block level
  • Population Census Tract tables (PCTn) are available to the census tract level only

Additional tables and maps have been derived from the detailed tables. For fast, easy access to all tables and maps in Summary File 1, go to the Data Sets page.

  • 1 Demographic Profile (DP) covering many population and housing characteristics for a single geography at a time.
  • 15 Quick Tables (QTn) that focus on a few population or housing characteristics for a single geography.
  • 15 Geographic Comparison Tables (GCTn) that focus on a few population or housing characteristics for many related geographic areas.
  • Over 100 Thematic Maps that focus on a single characteristic for many geographic areas.

Component ID: #ti763299928

Summary File 2 (SF2)

Summary File 2 (SF 2) contains 47 detailed tables focusing on age, sex, households, families, and occupied housing units for the total population. These tables are repeated for 249 detailed population groups based on the following criteria:

  • no tables are available for geographic areas having a population of less than 100
  • tables are repeated only for the race groups, American Indian and Alaska Native tribes, and Hispanic or Latino groups having a population of 100 or more within the geographic area.

For a complete list of the 249 population groups, see Appendix H of the SF 2 Technical Documentation (PDF). Data from the 2000 census will be released over the next two years on a flow basis.  These state-by-state news releases (including data for the District of Columbia and Puerto Rico) provide users these data on individual state web pages as they become available.

Component ID: #ti763299927

Summary File 3 (SF3)

Summary File 3 consists of 813 detailed tables of Census 2000 social, economic and housing characteristics compiled from a sample of approximately 19 million housing units (about 1 in 6 households) that received the Census 2000 long-form questionnaire. Fifty-one tables are repeated for nine major race and Hispanic or Latino groups: White alone; Black or African American alone; American Indian and Alaska Native alone; Asian alone; Native Hawaiian and Other Pacific Islander alone; Some other race alone; Two or more races; Hispanic or Latino; and White alone, not Hispanic or Latino.

Summary File 3 presents data for the United States, the 50 states, the District of Columbia and Puerto Rico in a hierarchical sequence down to the block group for many tabulations, but only to the census tract levels for others. Summaries are included for other geographic areas such as Zip Code Tabulation Areas (ZCTAsTM) and Congressional districts (106th Congress).

Summary File 3 includes 484 population tables and 329 housing tables that are identified according to geographic coverage:

  • Population (P) and Housing (H) tables are available to the block group
  • Population (PCT) and Housing (HCT) tables are available to the census tract level only

Component ID: #ti763299926

Summary File 4 (SF4)

Summary File 4 (SF4) contains the sample data, which is the information compiled from the questions asked of a sample of all people and housing units.

The sample data are presented in 213 population tables (matrices) and 110 housing tables, identified with "PCT" and "HCT", respectively. Each table is iterated for 336 population groups: the total population, 132 race groups, 78 American Indian and Alaska Native tribe categories (reflecting 39 individual tribes), 39 Hispanic or Latino groups, and 86 ancestry groups.

SF 4 is released as individual files for each of the 50 states, the District of Columbia, and Puerto Rico; and for the United States. The tables (matrices) are identical for all files, but the geographic coverage differs. Data are provided down to the census tract level.

Component ID: #ti763299925

American Indian and Alaska Native Summary File (AIANSF)

The American Indian and Alaska Native Summary File (AIANSF) contains sample data, which is the information compiled from the questions asked of a sample of all people and housing units.

The sample data are presented in 213 population tables (matrices) and 110 housing tables, identified with "PCT" and "HCT," respectively. The tables are repeated or iterated for the total population, the total American Indian and Alaska Native population, the total American Indian population, the total Alaska Native population, and for 1,081 additional specified American Indian and Alaska Native tribes. For any of these iterations, tables will be shown only if the specific population threshold is met. The population for the specific iteration in a specific geographic area must be at least 100 people (based on a 100-percent count) of the specified population and include at least 50 unweighted sample cases. This threshold is based on respondents who reported only one tribe.

The AIANSF is released as one file providing data for the United States, regions, divisions, states (excluding Puerto Rico as a state equivalent), metropolitan areas, American Indian and Alaska Native areas, and Hawaiian home lands.

Component ID: #ti763299932

2000 Apportionment Results

As a result of population changes between the 1990 and 2000 censuses, 8 states gained members and 10 states had fewer members in the House of Representatives. The regional patterns of change in congressional representation between 1990 and 2000 reflect the Nation’s continuing shift in population from the Northeast and Midwest to the South and West.

Based on the Census 2000 apportionment, each member of the U.S. House of Representatives represented an average population of 646,952.

Component ID: #ti1247720269

Data Release Schedule

Release Date* 100-Percent Data Products Lowest Level Geography
March 7-30, 2001 Census 2000 Redistricting Data Summary File
State population counts for race and Hispanic or Latino categories
Media: Internet, CD-ROM/DVD
Blocks
May 15, 2001 - June 7, 2001 Demographic Profile
Selected population and housing characteristics
Media: Internet, CD-ROM/DVD (available w/Summary File 1), paper
Places
(Note: Census tracts released June 13 -- August 22, 2001)
May 15, 2001 - June 7, 2001 Congressional District Demographic Profile
Same as profile described above but for Congressional Districts
Media: Internet, CD-ROM/DVD (available w/Summary File 1), paper
Congressional Districts of the 106th Congress
May 31, 2001 Census 2000 Housing Unit Counts
Medium: Internet
Places
June 27, 2001 Race and Hispanic or Latino Summary File
Media: Internet (FTP only), CD-ROM
Places

States:
June 13, 2001 - August 22, 2001



Advance national:
November 16, 2001
Final national:
October 23, 2002

Supplement:
June 11, 2003

Summary File 1 (SF 1):
  1. Population counts for 63 race categories and Hispanic or Latino
  2. Population counts for many detailed race and Hispanic or Latino categories, and American Indian and Alaska Native tribes
  3. Selected population and housing characteristics
  4. National-level files
[Urban/rural data are on the final national file--this is the only difference from the advance national file]
Media: Internet, CD-ROM/DVD

Summary File 1 Supplement: Urban/rural population and housing counts
Media: Internet, CD-ROM


  1. Blocks
  2. Census tracts
  3. Blocks/Census tracts
  4. Places







Blocks

States:
December 27, 2001 - April 24, 2002


Advance national:
May 29, 2002
Final national:
January 25, 2003

Summary File 2 (SF 2):
  1. Population and housing characteristics iterated for many detailed race and Hispanic or Latino categories, and American Indian and Alaska Native tribes

  2. National-level files
[Urban/rural data are on the final national file--this is the only difference from the advance national file]
Media: Internet, CD-ROM/DVD

Summary File 2 Supplement: Table showing sex by age for the population in households tabulated by the race, Hispanic origin, or tribe of the individual.
Media: Internet (FTP Only)


  1. Census tracts

  2. Places

States:
March 7, 2001 - April 24, 2002

National:
November 16, 2001 - January 25, 2003

Quick Tables
Table shells with population and housing characteristics where the user can specify a geographic area and a population group
Media: Internet, CD-ROM/DVD (available w/SF 1 and SF 2)

Census tracts

States:
March 7, 2001 - April 24, 2002

National:
November 16, 2001 - January 25, 2003

Geographic Comparison Tables
Population and housing characteristics for a list of geographic areas (e.g., all counties in a state)
Medium: Internet
Census tracts
May 30, 2002 - December 2, 2002 Summary Population and Housing Characteristics (PHC-1)
Media: Internet, paper (printed report)
Places
June 11, 2003 - April 8, 2004 Population and Housing Unit Counts (PHC-3)
* This report contains selected historical counts
Media: Internet, paper (printed report)
Places



Release Date* Sample Data Products Lowest Level Geography
May 7, 2002 - June 4, 2002 Demographic Profile
Demographic, social, economic, and housing characteristics presented in three separate tables [PDF]
Media: Internet, CD-ROM/DVD (available w/Summary File 3), paper
Places
(Note: Census tracts released August 6 -- September 25, 2002)
May 7, 2002 - June 4, 2002 Congressional District Demographic Profile
Same as profile described above but for Congressional Districts
Media: Internet, CD-ROM/DVD (available w/Summary File 3), paper
Congressional Districts of the 106th Congress
August 6, 2002 - September 25, 2002 Summary File 3 (SF 3):
  1. Population counts for ancestry groups
  2. Selected population and housing characteristics
  3. National-level file
Media: Internet, CD-ROM/DVD

  1. Census tracts
  2. Block groups/ Census tracts

  3. Places
April 29, 2003 - July 30, 2003 Summary File 4 (SF 4):
  1. Population and housing characteristics iterated for many detailed race and Hispanic or Latino categories, American Indian and Alaska Native tribes, and ancestry groups

  2. National-level file
Media: Internet, CD-ROM/DVD

  1. Census tracts

  2. Places
August 6, 2002 - July 30, 2003 Quick Tables
Table shells with population and housing characteristics where the user can specify a geographic area and a population group
Media: Internet, CD-ROM/DVD (available w/SF 3 and SF 4)
Census tracts
August 6, 2002 - July 30, 2003 Geographic Comparison Tables
Population and housing characteristics for a list of geographic areas (e.g., all counties in a state)
Medium: Internet
Census tracts
For 1-percent sample:
April 23, 2003 - June 4, 2003







For 5-percent sample:
August 6, 2003 - September 24, 2003
Public Use Microdata Sample (PUMS) Files
  • 1-percent sample files (information for states, and for substate areas except for AK, DE, DC, ND, SD, VT, and WY since they do not meet the minimum size requirement for substate areas)
  • Record layout [Excel 641k] for the 1-percent sample files is available on the Internet
Media: Internet (FTP only), CD-ROM
  • 5-percent sample files (information for state and sub-state areas)
  • Record layout [Excel 391k] for the 5-percent sample files is available on the Internet
Media: Internet (FTP only), DVD
(Note: 1-percent files also will appear on this DVD)
Super Public Use
Microdata Areas
(Super-PUMAs) of
400,000+





PUMAs of
100,000+
March 13, 2003 - July 24, 2003 Summary Social, Economic, and Housing Characteristics (PHC-2)
Media: Internet, paper (printed report)
Places
March 17, 2003 Congressional District Data Summary File
100-percent and sample data for the redistricted 108th Congress
Media: Internet, CD-ROM/DVD
Census tracts within Congressional Districts

* The dates in this column refer to the first medium of release.

GENERAL--Census 2000 data products meet a variety of data needs for different segments of the data user community. The data products described here provide a summary of the general tabulation and publication program for the 50 states, the District of Columbia, and Puerto Rico (which is treated as a state equivalent for each data product). For more information on Census 2000 data products, please call Customer Services on 301-763-4636 (or 301-763-INFO).

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