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Changes to Format of the ACS Summary File

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Changes to Format of the ACS Summary File

​The 2021 American Community Survey (ACS) 1-year Summary File will be released as a table-based format, replacing the prior sequence-based Summary File format.

Each ACS Detailed Table will be available as a separate file containing the estimate and margin of error for all published geographies. Data users will no longer be required to identify which sequence file their table of interest appears in, or combine multiple files in order to use the data.

To aid in this transition, the prior sequence-based format will be also available for the 2021 ACS 1-year and 2017-2021 ACS 5-year releases but discontinued thereafter.

For more information, visit the ACS Summary File page. 

Page Last Revised - September 15, 2022
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