Native North American Languages Spoken at Home in the United States: 2006-2010
http://www.census.gov/prod/2011pubs/acsbr10-10.pdf
This report presents data on the frequency and percentage of the U.S. population aged five and over who spoke a Native North American language at home. Also includes a map of U.S. counties showing the density of residents who spoke a Native North American language. From the Census Bureau
