As of the 2010 United States Census, there were 12,765 people, 5,605 households, and 3,511 families living in the county. The population density was . There were 7,061 housing units at an average density of . The racial makeup of the county was 95.4% white, 1.4% American Indian, 0.4% Asian, 0.2% black or African American, 0.1% Pacific islander, 0.5% from other races, and 2.0% from two or more races. Those of Hispanic or Latino origin made up 3.0% of the population. In terms of ancestry, 32.2% were German, 17.6% were Irish, 13.5% were English, 6.4% were Norwegian, and 4.4% were American.