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Public Use Microdata Sample (PUMS)

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Within American Community Survey (ACS)

Public Use Microdata Sample (PUMS)

Understanding and Using the American Community Survey Public Use Microdata Sample Files
Download Understanding and Using the American Community Survey Public Use Microdata Sample Files [PDF - 4.6 MB]

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.”

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PUMS Data
Access ACS Public Use Microdata Sample (PUMS) data available through the File Transfer Protocol (FTP) site and through data.census.gov.
Data
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.
PUMS Documentation
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.
Data
PUMS FAQs
Find answers to common questions about the ACS Public Use Microdata Sample (PUMS) files.

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Page Last Revised - December 15, 2022
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