As of the 2010 census, there were 22,398 people, 9,293 households, and 5,746 families in the county. The population density was . There were 10,464 housing units at an average density of . The racial makeup of the county was 92.1% white, 4.0% American Indian, 0.4% Asian, 0.3% black or African American, 0.3% from other races, and 2.9% from two or more races. Those of Hispanic or Latino origin made up 1.9% of the population. In terms of ancestry, 46.2% were of Norwegian, 35.9% of German, 9.8% of Irish, 4.5% of Swedish and 4.4% of English ancestry.