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.Read More
Here are the different methods to respond to the BAS.
Important dates to know for the Boundary and Annexation Survey (BAS).
Respondent How-To Guides
Here are the different how-to guides for BAS.
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 and TIGERweb Decennial web-based applications allow visualization of TIGER (Topologically Integrated Geographic Encoding and Referencing) data.