US Department of the Interior, Indian Affairs
The Bureau of Indian Affairs (BIA) provides services to American Indians and Alaska Natives and is responsible for the administration and management of 55 million surface acres and 57 million acres of subsurface minerals estates held in trust by the US for American Indians, Indian tribes, and Alaska Natives.
American FactFinder : "Your source for population, housing, economic, and geographic data." From the U.S. Census Bureau this system will find and retrieve the information from some of the Census Bureau's largest data sets.
Census 2010 : 2010 Census website. Note: Not all 2010 Census reports have yet been released.