As of the 2010 census, there were 76,569 people, 27,500 households, and 19,967 families living in the county. The population density was . There were 30,085 housing units at an average density of . The racial makeup of the county was 73.2% white, 3.8% American Indian, 1.4% black or African American, 0.5% Asian, 0.1% Pacific islander, 17.0% from other races, and 4.0% from two or more races. Those of Hispanic or Latino origin made up 58.3% of the population. In terms of ancestry, 10.9% were German, 6.7% were English, 6.1% were Irish, and 4.2% were American.