UNITED STATES DEPARTMENT OF COMMERCE 
Economics and Statistics Administration

BAS-11(L) 

U.S. Census Bureau 
(9-2012) 

Washington, DC 20233-0001 
OFFICE OF THE DIRECTOR 

FROM THE DIRECTOR 

U.S. CENSUS BUREAU 
The U.S. Census Bureau conducts the Boundary and Annexation Survey (BAS) to update our 
records regarding changes to legal boundaries, names, and governmental status for federally 
recognized American Indian reservations, off-reservation trust land, and tribal subdivisions 
within the United States effective on or before January 1 of the survey year. This voluntary 
survey is an important opportunity for you to ensure that we have your correct boundary and 
legal name. The Census Bureau will use the boundary information you provide to report data 
from the American Community Survey (ACS) and other Census programs and surveys. 

The enclosed checklist contains information about the materials in your BAS package, as well 
as how to change your response method. Information describing how to update the enclosed 
materials is available in the BAS Tribal Respondent Guide. This information is also provided on 
the BAS Web site at <http://www.census.gov/geo/www/bas/bashome.html>. 

All legal boundary changes received by March 1 will be included in this year’s boundary 
delivery for the ACS. All legal boundary changes and boundary corrections received by 
May 31 will be included in your BAS materials for next year. If you need any assistance with 
this request, please e-mail <geo.aiana@census.gov>, telephone 1–800–972–5651, or visit our 
Web site at <http://www.census.gov/geo/www/bas/bashome.html>. 

The Census Bureau appreciates your response to this important voluntary survey. 

Sincerely, 

Thomas L Mesenbourg, Jr. 
Acting Director 

Enclosures 


census.gov