At the 2010 United States Census, there were 21,720 people, 7,790 households and 5,646 families living in the county. The population density was . There were 9,815 housing units at an average density of . The racial make-up was 69.0% white, 16.9% American Indian, 0.6% black or African American, 0.4% Asian, 0.1% Pacific islander, 9.1% from other races, and 3.8% from two or more races. Those of Hispanic or Latino origin made up 19.3% of the population. In terms of ancestry, 15.0% were German, 9.4% were Irish, 8.3% were English, and 4.9% were American.