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Boundary and Annexation Survey (BAS)

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Boundary and Annexation Survey (BAS)

The U.S. Census Bureau conducts the Boundary and Annexation Survey (BAS) annually to collect information about selected legally defined geographic areas. BAS is used to update information about the legal boundaries and names of all governments.

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Respond to BAS
Complete the Boundary and Annexation Survey (BAS) Annual Response Form.
BAS Participation and Response
Maps showing Boundary and Annexation Survey (BAS) participation and response information.
BAS Videos
2023
This collection of videos provides an overview of the Boundary and Annexation Survey (BAS) and information needed to get started with a program submission.

Response Info

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Response Methods
Methods for creating a submission and reporting updates to the Boundary and Annexation Survey (BAS).
BAS Schedule
Important dates to know for the Boundary and Annexation Survey (BAS).
Respondent How-To Guides
How-to guides for the different response methods for the Boundary and Annexation Survey (BAS).

Reviewing Tools

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2023 BAS Maps
2023
The 2023 BAS maps display legal boundaries and names as reported through the 2022 BAS.
2023 BAS Partnership Shapefiles
Download the Census Bureau's 2023 BAS partnership shapefiles to review and update your boundaries.
Data Tool
TIGERweb
TIGERweb and TIGERweb Decennial web-based applications allow visualization of TIGER (Topologically Integrated Geographic Encoding and Referencing) data.

BAS Agreements

BAS Agreements
Boundary and Annexation Survey (BAS) Agreements help coordinate information sharing between state and county governments and the Census Bureau.

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Page Last Revised - February 7, 2023
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