As of the 2010 Census, there were 75,455 people, 29,743 households, and 20,104 families residing in the county. The population density was . There were 34,050 housing units at an average density of . The racial makeup of the county's population: 89.7% white, 1.4% American Indian, 0.9% Asian, 0.5% black or African American, 0.2% Pacific islander, 4.0% from other races, and 3.2% from two or more races. Those of Hispanic or Latino origin made up 8.7% of the population. In terms of ancestry, 24.1% were German, 14.9% were Irish, 12.5% were English, 7.7% were American, and 5.1% were Norwegian.