BAS Schedule

The Boundary and Annexation Survey (BAS) is an annual survey which follows the activity and outreach schedules below. If you have any questions regarding this schedule, please Contact Us.

IMPORTANT: The 2026 BAS is delayed and will begin in early February. Unfortunately, we are not able to adjust the March 1, 2026, deadline. If you have concerns about meeting the March 1 deadline for receiving submissions, email us at [email protected].

Activity Schedule

Date	Activity
January 1	Legal boundary changes must be legally in effect on or before this date to be reported in the current survey year.
January to May	The Census Bureau conducts BAS. Eligible governments respond to BAS indicating if they have legal boundary, census designed place (CDP), linear feature, or contact updates to report. Those with updates can choose to create their submission using the Census Bureau's BAS Partnership Toolbox, Geographic Update Partnership Software Web (GUPS Web), or paper maps.
March 1	Legal boundary changes returned by this date will be reflected in the American Community Survey and Population Estimates Program data and in next year's BAS materials.
May 31	Legal boundary changes returned by this date will be reflected in next year's BAS materials. If time permits, boundary corrections returned by this date may also be reflected in next year's BAS materials.

BAS Outreach

Date	Activity
Early January	The Census Bureau notifies eligible governments about BAS through email. Eligible governments are contacted through email to determine if they have legal boundary, CDP, linear feature, or contact updates to report.