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. The BAS is used to update information about the legal boundaries and names of all governments.

What is the BAS?

How to Get Started

Boundary Validation Program (BVP)

Response 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.

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Reviewing Tools

BAS Partnership Tools

BAS partnership tools to help BAS participants.

DATA TOOL

TIGERweb

TIGERweb and TIGERweb Decennial web-based applications allow visualization of TIGER (Topologically Integrated Geographic Encoding and Referencing) data.

GUPS Download and Installation Instructions

These instructions are for participants who will use the Geographic Update Partnership Software (GUPS) to respond to the BAS.

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Response Methods

Here are the different methods to respond to the BAS.

Training Events

BAS On-Site Training and Webinars

The U.S. Census Bureau will offer informational Boundary and Annexation Survey (BAS) webinars and on-site workshops in early 2020.

Boundary and Annexation Survey (BAS)

Boundary and Annexation Survey (BAS)

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