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Boundary and Annexation Survey (BAS)

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About this Survey

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Guidance for Geography Users

Final BVP and BAS Reference Maps

Maps displaying updates submitted through the 2020 BAS by March 1, 2020 and maps with updates valid through January 1, 2019, submitted during the 2019 BAS.

File Naming Conventions

Information about how Final BVP and BAS map files are named.

BAS Code Lists

All federally recognized American Indian areas, counties, incorporated places, consolidated cities, and governmental MCDs are identified by a unique BAS ID.

Last Revised: December 4, 2017