As of the 2010 United States Census, there were 3,151 people, 1,385 households, and 873 families in the county. The population density was . There were 1,683 housing units at an average density of . The racial makeup of the county was 97.9% white, 0.6% American Indian, 0.1% black or African American, 0.1% Asian, 0.9% from other races, and 0.5% from two or more races. Those of Hispanic or Latino origin made up 2.5% of the population. In terms of ancestry, 47.4% were German, 28.1% were Norwegian, 9.9% were Irish, 6.4% were Swedish, 6.4% were English, 5.4% were American, and 5.2% were Polish.