As of the 2010 United States Census, 75,889 people, 26,904 households, and 18,647 families resided in the county. The population density was . The 29,693 housing units had an average density of . The racial makeup of the county was 79.1% White, 3.5% American Indian, 0.9% Asian, 0.8% Black or African American, 0.1% Pacific islander, 12.5% from other races, and 3.1% from two or more races. Those of Hispanic or Latino origin made up 23.9% of the population. In terms of ancestry, 21.4% were German, 12.8% were Irish, 11.6% were English, and 5.6% were American.