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Sources for Census Data Files
IPUMS-USA 1850 to present
The Integrated Public Use Microdata Series (IPUMS-USA) consists of more than sixty integrated, high-precision samples of the American population drawn from sixteen federal censuses, from the American Community Surveys of 2000-present, and from the Puerto Rican Community Surveys of 2005-present. IPUMS is not a collection of compiled statistics; it is composed of microdata
which requires statistical analysis software (SAS, SPSS, Stata, R, etc.) to view and manipulate.
United States Census Bureau Data Repository
Alongside the Census Bureau datasets which have been available through ICPSR for decades this repository also makes available survey instruments, specifications, data dictionaries, codebooks, and other materials provided by the Census Bureau.
United States Census Data @ ICPSR
ICPSR archives and disseminates census data acquired from the United States Census Bureau as well as files prepared by ICPSR and other principal investigators. Both microdata and aggregate data constitute ICPSR's census holdings. The microdata comprise individual responses to census questions while the aggregate data contain tabulations of the individual responses at various aggregate levels of observation such as states, counties, places, and census tracts.
Decennial Census PUMS
1% and 5% Public Use Microdata Samples (PUMS) are linked here for Census 2000 and 1990. 1980 files are described and also available from the National Archives
Raw Data Illustration
This image is taken from the 2000 IPUMS data, 1% sample of Illinois. This data is not compiled into statistical tables. It is machine readable, raw, data for use with statistical analysis software.