The Census Bureau’s American Community Survey (ACS) Public Use Microdata Sample (PUMS) files enable data users to create custom estimates and tables, free of charge, that are not available through ACS pretabulated data products. The ACS PUMS files are a set of records from individual people or housing units, with disclosure protection enabled so that individuals or housing units cannot be identified.
The Census Bureau produces ACS 1-year and 5-year PUMS files. These files are accessible using the microdata access tool on data.census.gov and the Census Bureau's FTP site.* Only selected geographic areas are identified in the ACS PUMS, including nation, regions, divisions, states, and Public Use Microdata Areas (PUMAs). Of these, PUMAs are the most detailed geographic areas available.
*Please note that the 2020 ACS 1-year PUMS with Experimental Weights will not be available on data.census.gov. However, previous years are available. See the note below for more information.
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 to access the files as well as related technical documentation.
Accessing PUMS Data
Access ACS Public Use Microdata Sample (PUMS) data available through the the File Transfer Protocol (FTP) site and through data.census.gov.
How to Use PUMS on data.census.gov
Learn more about how to use the microdata access tool on data.census.gov with the ACS Public Use Microdata Sample (PUMS) files.
Learn more about how to work with ACS Public Use Microdata Sample (PUMS) files with resources such as the ReadMe, Data Dictionaries, Code Lists, and more.