As of the 2010 census, there were 4,320 people, 1,915 households, and 1,234 families residing in the county. The population density was . There were 2,488 housing units at an average density of . The racial makeup of the county was 97.3% white, 0.6% American Indian, 0.5% Asian, 0.3% black or African American, 0.1% Pacific islander, 0.3% from other races, and 0.8% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 26.5% were Irish, 23.8% were German, 10.4% were English, and 4.3% were American.