The data collected by the decennial census have changed over the decades. In 1790, each household provided the name of head of family and the number of persons in each household in five categories.

By Census 2000, the short-form asked 7 questions of all residents, while the long-form added 26 population and 20 housing questions for about one in every six households.

In 2005, the American Community Survey (ACS) replaced the long-form, which allowed the 2010 Census to ask just 10 questions about each person. The results from the 2010 Censuses are available in a number of datasets in Explore Census Data.

Decennial Census of Population and Housing APIs

Census Bureau datasets are available via API. Check out our Discovery Tool. Sign up for our newsletter. Visit our Developers Forum to learn more.

Decennial Census of Population and Housing Datasets

Data files, for public use, with all personally identifiable information removed to ensure confidentiality. Users analyze, extract, customize and publish stats.

Decennial Census of Population and Housing Data Tables

Stats displayed in columns and rows with title, ID, notes, sources and release date. Many tables are in downloadable XLS, CSV and PDF file formats.

Decennial Census of Population and Housing Data Tools

Interactive applications, created by the Census Bureau, to help you customize, and even visualize, statistics from multiple censuses, surveys, and programs.

Decennial Census of Population and Housing Errata Notes

Identified errors are reported, corrected, and re-released. Below is a list of each reissued file with the date of reissue and a brief description.

Decennial Census of Population and Housing Special Tabulations

When requesting a special tabulation, the sponsor should provide a preliminary, general specification of the data needed.