As of the 2010 United States Census, there were 5,148 people, 2,222 households, and 1,418 families in the county. The population density was . There were 2,720 housing units at an average density of . The racial makeup of the county was 98.1% white, 0.5% American Indian, 0.3% Asian, 0.1% black or African American, 0.3% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 1.4% of the population. In terms of European ancestry, 42.8% were German, 25.5% were Norwegian, 10.9% were Danish, 9.6% were Irish, 7.2% were English, and 3.5% were American.