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American Community Survey 5-Year Data 2021

Variable Changes

Variables, and the values they represent, may change over time. Use this 2021 5YR API Changes document as a guide for which variables have changed from the prior year for 2021 ACS 5-Year Detailed Tables, Data Profiles and Subject Tables. See below for a description of each change type.

  • No Change - The variable has not changed from the prior year (most variables).
  • Updated - That variable has changed from the prior year and a matching variable for the current year has been found.
  • No Match - The variable has changed from the prior year and no matching or comparable variable has been found.

For table changes, check the ACS product changes webpage for source table changes.

Label Changes to 2021 ACS 5-Year Geographies

With the 2021 ACS 5-Year data now available, please note that there are label changes to some geographies found in the 2021 5-Year ACS API.  While there are no underlying changes to how these geographies are defined, the change in the label does impact the syntax of the geography portion of the API queries, meaning that queries using these geographies from the 2020 5-Year ACS or earlier will not work.  If you use any of these geographies in your queries, please be sure to update the geographic syntax prior to retrieving data from the 2021 5-Year ACS API.

The impacted geographies are: CLICK HERE.

Geography Note

The 2017-2021 ACS 5-year data products that report data related to Congressional Districts are based on the 116th Congress. The Census Bureau does not collect congressional district boundaries from the states during the congressional session that aligns with the decennial census (e.g., 117th). Additional explanation can be found in our geographic user note.

Annotation Variables

In September 2016, ACS released annotation variables that return character representations of each estimate. Many annotations return as null. However, if an annotation variable returns a value, it provides important information about the estimate or margin of error. For example, if an estimate variable (variable ending in “E”) returns “-888888888”, the annotation variable will return “(X)”. Looking at the Notes on ACS Estimates and Annotation Values, this means the estimate is not applicable or not available. For a complete list of return values and their annotations, see Notes on ACS Estimates and Annotation Values.

Selected Population Detailed Tables

Selected Population Data Profiles

American Indian and Alaska Native Detailed Tables

American Indian and Alaska Native Data Profiles

Page Last Revised - June 1, 2023
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