PUMS Documentation
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.
PUMS Documentation
PUMS ReadMe
Important information about 2019 geography and variable changes, as well as guidance for novice ACS PUMS files users.
2015-2019 ACS 5-year PUMS ReadMe
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2019 ACS 1-year PUMS ReadMe
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Subjects in the PUMS
A list of topics included in each of the housing and population record files
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2015-2019 ACS 5-year PUMS Subjects
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2019 ACS 1-year PUMS Subjects
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PUMS Data Dictionary
Includes variables available for each PUMS release and how each variable is coded
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2019 ACS 1-year PUMS Data Dictionary
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2019 ACS 1-year PUMS Data Dictionary
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2019 ACS 1-year PUMS Data Dictionary
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Code Lists
Detailed codes for variables that contain a large number of coded responses, such as ancestry and occupation
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2015-2019 ACS 5-year PUMS Code Lists
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2019 ACS 1-year PUMS Code Lists
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PUMS Top Coded and Bottom Coded Values
List of variables with responses exceeding a state-specific value that are replaced with a predetermined value.
Accuracy of the PUMS
A basic explanation of the sample design, estimation methodology, and accuracy of the data.
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2015-2019 ACS 5-year PUMS Accuracy [PDF]
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2019 ACS 1-year PUMS Accuracy [PDF]
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PUMS Estimates for User Verification
Note that some of these estimates may be different from the estimates for the same characteristics published in data.census.gov. For an explanation of these differences, see the Accuracy of the PUMS above.
2019 ACS 1-year PUMS estimates [SAS]
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2019 ACS 1-year PUMS estimates [CSV]
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2019 ACS 1-year PUMS record counts [CSV]
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