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2020 ACS 1-Year Public Use Microdata Sample with Experimental Weights

Visit the File Transfer Protocol (FTP) site linked below to access the tables for the 2020 ACS 1-year PUMS with Experimental Weights. The 2020 ACS 1-year PUMS with Experimental Weights files are available for the nation, regions, divisions, states, and Public Use Microdata Areas (PUMAs). Technical Documentation for this release is located under PUMS Technical Documentation below. You can also browse the pages under Explore More for additional information.


Guidance for novice ACS PUMS files users.

PUMS Variable Changes and Explanations

Important information about 2020 geography and variable changes.

Subjects in the PUMS

A list of topics included in each of the housing and population record files.

PUMS Data Dictionary

Includes variables available for each PUMS release and how each variable is coded.

Code Lists

Detailed codes for variables that contain a large number of coded responses, such as ancestry and occupation.

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.

PUMS Estimates for User Verification

Examples of PUMS estimates with their standard error and margin of error.

PUMS Record Counts

Counts of unweighted records for each PUMS file.

Page Last Revised - May 27, 2022
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