Work with interactive mapping tools from across the Census Bureau.
Read briefs and reports from Census Bureau experts.
Watch Census Bureau vignettes, testimonials, and video files.
Read research analyses from Census Bureau experts.
Developer portal to access services and documentation for the Census Bureau's APIs.
Explore Census Bureau data on your mobile device with interactive tools.
Find a multitude of DVDs, CDs and publications in print by topic.
These external sites provide more data.
Download extraction tools to help you get the in-depth data you need.
Explore Census data with interactive visualizations covering a broad range of topics.
Information about the U.S. Census Bureau.
Information about what we do at the U.S. Census Bureau.
Learn about other opportunities to collaborate with us.
Explore the rich historical background of an organization with roots almost as old as the nation.
Explore prospective positions available at the U.S. Census Bureau.
Information about the current field vacancies available at the U.S. Census Bureau Regional Offices.
Discover the latest in Census Bureau data releases, reports, and events.
The Census Bureau's Director writes on how we measure America's people, places and economy.
Find interesting and quirky statistics regarding national celebrations and major events.
Find media toolkits, advisories, and all the latest Census news.
See what's coming up in releases and reports.
Each state-level entity file is comprised of a record for each unique spatial 1990/2000 census tract area combination within the state. In addition to the 1990 and 2000 census tract codes, each record contains three population figures; the Census 2000 population for the record, the Census 2000 population for the entire 2000 census tract, and the actual or estimated Census 2000 population for the area of the 1990 census tract (not the 1990 population for the 1990 census tract). Also, to identify changes and the proportion of change, the record includes "part" indicators for both the 1990 and 2000 census tracts, and the percent of the Census 2000 population represented for the 1990 and 2000 census tracts represented in that record.
Note: As part of the procedure to provide 2000 population data for 1990 census tracts, the Census Bureau has rounded the Census 2000 tabulation block population data for some of the blocks that are split by 1990 census tract boundaries. This rounding procedure may create individual census tract, county, and/or state population totals that are slightly different from the official Census 2000 population totals. Also, the Census 2000 population for the 1990 census tract and for the record is an estimate for each 1990 census tract that had a 1990 boundary not identical to a Census 2000 census block boundary.
This file type is almost identical to the population-based census tract relationship files, except that these files use street-side mileage, rather than population, as a means to measure relationship.
This file type lists those 1990 census tracts that have exhibited a change of 2.5-percent or more for 2000. It uses the data contained in the population-based census tract relationship file.
Note: The amount of change of 2.5-percent or greater can reflect either a sum of gain or loss of Census 2000 population within a given census tract.
This file type lists all 2000 census tracts that had more than 2.5-percent of their Census 2000 population in a different 1990 census tract.
Note: This file was generated by using the national population-based file to identify all 2000 census tracts that did not have 97.5% of their population in a 1990 census tract with the same number.