The U.S. Census Bureau conducts the Boundary and Annexation Survey (BAS) annually to collect information about selected legally defined geographic areas. The BAS is used to update information about the legal boundaries and names of all governments.
Read MoreResponse Info
BAS Questionnaires
Access the BAS Annual Response/Contact Update form here.
BAS State Agreements
The purpose of a BAS state agreement is to coordinate information sharing between state governments and the Census Bureau.
Consolidated BAS (CBAS) Agreements
The Census Bureau offers Consolidated BAS agreements to counties interested in submitting boundary changes for the legal governments within their jurisdiction.
Reviewing Tools
BAS Partnership Tools
BAS partnership tools to help BAS participants.
TIGERweb
TIGERweb and TIGERweb Decennial web-based applications allow visualization of TIGER (Topologically Integrated Geographic Encoding and Referencing) data.
Response Methods
Training Events