View the available subjects, detailed codes for variables, changes related to each release, an explanation of sample design, methodology, and accuracy, and files to determine if you are using weights correctly for the American Community Survey Public Use Microdata Sample (PUMS) files. These documents are organized by data year.
Supporting data for the documentation below is available on the Accessing PUMS Data page.
The Census Bureau did not release its standard 2020 ACS 1-year Public Use Microdata Sample (PUMS) data because of the impacts of the COVID-19 pandemic. The PUMS data have been released with experimental weights and replicate weights and are available for the nation, regions, divisions, states, and Public Use Microdata Areas (PUMAs). Please visit the link below to be directed to the 2020 ACS 1-year PUMS with Experimental Weights. Here you can access the files as well as related technical documentation. The experimental PUMS files will not be released on data.census.gov.
The Census Bureau released the 2016-2020 ACS 5-year PUMS files as part of its standard release for the ACS 5-year products after determining the resulting data were fit for public release.