As of the 2010 United States Census, there were 11,586 people, 5,099 households, and 3,202 families living in the county. The population density was . There were 5,836 housing units at an average density of . The racial makeup of the county was 96.6% white, 1.2% American Indian, 0.2% black or African American, 0.2% Asian, 0.2% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 1.5% of the population. In terms of ancestry, 30.8% were German, 15.9% were English, 14.7% were Norwegian, 12.8% were Irish, and 4.2% were American.