As of the 2010 United States Census, there were 5,255 people, 2,136 households, and 1,375 families in the county. The population density was . There were 2,433 housing units at an average density of . The racial makeup of the county was 88.4% white, 8.5% American Indian, 0.2% black or African American, 0.2% Asian, 0.3% from other races, and 2.4% from two or more races. Those of Hispanic or Latino origin made up 1.4% of the population. In terms of ancestry, 51.7% were German, 11.7% were Irish, 11.5% were Czech, 10.9% were Norwegian, 6.2% were English, and 1.3% were American.