The U.S. Census Bureau has two main programs designed to collect and maintain geographic information on tribal areas: the Boundary and Annexation Survey (BAS) and the Tribal Statistical Areas Program (TSAP). Please see the links below for more information on these programs and American Indian and Alaska Native geography:
The Census Bureau conducts the Boundary and Annexation Survey (BAS) yearly to update and maintain information about legal boundaries, names and official status of federally recognized American Indian reservations and/or off-reservation trust lands, as well as counties, incorporated places and minor civil divisions. The information collected is used to tabulate and report statistical data from various Census Bureau surveys, such as the American Community Survey and 2010 Census.
In February 2014, the Census Bureau and National American Indian Housing Council (NAIHC) signed a Memorandum of Agreement in support of the Tribal BAS.
In January 2016, the Census Bureau and the Bureau of Indian Affairs signed a Memorandum of Agreement in support of the Tribal BAS.
In support of the government-to-government relationship with federally recognized American Indian tribes, the Census Bureau works directly with tribal officials to maintain a current and comprehensive inventory of legally defined tribal lands. Detailed information about current Tribal BAS participation, materials and workshops can be accessed at the BAS website.
Boundary and Annexation Survey (BAS)
The Census Bureau conducts the BAS annually to collect information about selected legally defined geographic areas.
In preparation for Census 2010, the Census Bureau offered officials from federally and state recognized tribes, Alaska Native Villages and Alaska Native Regional Corporations the opportunity to review and update the following geographic areas: