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Boundary and Annexation Survey (BAS)
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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Response Info
Response Methods
Here are the different methods to respond to the BAS.
BAS Schedule
Important dates to know for the Boundary and Annexation Survey (BAS).
Respondent How-To Guides
Here are the different how-to guides for BAS.
Reviewing Tools
2022 BAS Maps
The 2022 BAS maps display legal boundaries and names as reported through the 2021 BAS.
2022 BAS Partnership Shapefiles
Download the Census Bureau's 2022 BAS partnership shapefiles to map your boundaries.
TIGERweb
TIGERweb and TIGERweb Decennial web-based applications allow visualization of TIGER (Topologically Integrated Geographic Encoding and Referencing) data.
BAS Agreements
Yes
No
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