Boundary and Annexation Survey (BAS) Mapping Tools

Tools, such as TIGERweb allow participants to review their boundaries online, and the BAS Partnership Toolbox and GUPS Web allow participants to make updates to their boundaries.

BAS Partnership Tools

BAS partnership tools to help BAS participants create submissions with Esri’s ArcGIS Desktop or ArcGIS Pro.

GUPS Web

GUPS Web is a customized web-based GIS application. GUPS Web allows partners to import local government boundary data, automate boundary change creation, create changes manually and export standardized files for submission to the Census Bureau.

If you would like to use GUPS Web for the 2026 BAS, please complete the Annual Response Form. For questions about GUPS Web, check out the GUPS Web Help Guide within the application or email us at [email protected].