The US Census Bureau have made available an interactive map showing the distribution of major languages in the United States. The map provides lots of potentially surprising information, and can function as a useful research tool.
For all its strengths, it is disappointing to not to be able to find Native American languages. Navajo, for instance, is the most common minority language spoken in Northern Arizona, as well as McKinley County (New Mexico), San Juan County (New Mexico) and San Juan County (Utah). One imagines it would form a solid group of dots among these three states, had it been included in the map settings. Such omissions, though by no means deliberately racist (or linguicist, to use a more accurate term if less prevalent term), seem indicative of a pro-western linguistic bias.