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2024 American Community Survey (ACS) 1-year Public Use Microdata Sample (PUMS) files and 2024 ACS 1-year Supplemental Estimates are now available.

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Table & Geography Changes

Table & Geography Changes

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Within Technical Documentation

Code Lists, Definitions, and Accuracy
Data Release Rules
Errata Notes
Table & Geography Changes
Table Shells and Table List
User Notes

Table & Geography Changes

Learn more about changes to tables and geography for each American Community Survey data release.

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2021

Table Changes

2021 ACS 1-year Estimates
2021 ACS 1-year Supplemental Estimates
2017-2021 ACS 5-year Estimates

Geography Changes

2021 Geography Changes

View the various changes to Census geography this year, as well as information about geographic comparability and available vintages.