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Public Use Microdata Sample (PUMS)

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.

Check out our handbook, Understanding and Using the ACS PUMS Files, to learn more about working with PUMS files.  Additional user resources are available under “Related Information.”

Page Last Revised - December 15, 2022
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