From the U.S. Census:
We are pleased to announce the release of the 2006-2010 American Community Survey (ACS) Selected Population Tables and the 2006-2010 ACS American Indian and Alaska Native Tables.
This is the first time new detailed estimates about the social, economic and housing characteristics of hundreds of race, tribal, Hispanic and ancestry groups at numerous geographic levels have been available since the 2000 Census.
The 2006-2010 ACS Selected Population Tables include characteristics estimates for the 392 race, Hispanic origin, ancestry and tribal groups that had a national population of at least 7,000. Estimates are published for an individual group in a particular geographic area if it had at least 50 group members in the survey during the five-year survey period. Census tracts are the lowest geographic level available to groups meeting the two thresholds.
The 2006-2010 ACS American Indian and Alaska Native Tables include characteristics estimates for 950 American Indian and Alaska Native groups that had a national population of at least 100. Estimates are published for an individual tribe in a particular geographic area if it had at least 50 group members in the survey during the five-year survey period. Fewer geographic types are available, but the release includes Alaska Native Regional Corporations and American Indian and Alaska Native Areas and Hawaiian Home Lands.