This page will provide some notes about locating U.S. decennial census data for your research projects. You can also email us at ilrref@cornell.edu or stop by the reference suite in Catherwood Library for an individual consultation!
data.census.gov is the US Census Bureau's new website to distribute and make available census and survey data. It was launched in 2019 as a replacement for American Factfinder. It is a searchable database of data tables and maps containing information from the following census and survey tools.
For a complete list, visit data.census.gov's FAQ page. From that page, click on "data.census.gov" -> "Data available" -> "What data are available in data.census.gov?"
Note that data from the ACS are used to make estimates for the greater population. Data are available as follows:
Beginning in 1940, the census began to incoporate sampling procedures to collect supplementary data (released as supplementary reports of various kinds).
In 1960, the census was conducted using a short form, asked of every household, and a much longer, two-part form, asked of 20% of households.
By 1980, a short form went out to every household, and the long form, sample data, was asked of 1-in-6 households.
SF 3 -- Data is from a much longer, more detailed, list of questions asked of 1-in-6 households.
American Community Survey: The ACS is a continuous, rolling, survey of 1-in-8 households. Data is released in 1-year, 3-year*, and 5-year estimates.
*ACS 3-year estimates have been discontinued.
See: Comparing ACS data