As of the 2010 census, there were 20,640 people, 7,212 households, and 5,147 families residing in the county. The population density was 4/km2 (10/mi2). There were 8,208 housing units at an average density of 2/km2 (4/mi2). The racial makeup of the county was 75.7% White, 1.6% Black or African American, 1.3% Native American, 1.6% Asian, 0.2% Pacific Islander, 16.9% from other races, and 2.8% from two or more races. 42.0% of the population were Hispanic or Latino of any race (34.3% Mexican, 3.5% Guatemalan, 0.7% Cuban, 0.7% Spanish). 65.7% spoke English and 33.1% Spanish as their first language.