As of the 2010 United States Census, there were 4,029 people, 1,715 households, and 1,126 families residing in the county. The population density was . There were 2,010 housing units at an average density of . The racial makeup of the county was 98.1% white, 0.6% Asian, 0.5% American Indian, 0.2% black or African American, 0.1% from other races, and 0.5% from two or more races. Those of Hispanic or Latino origin made up 0.9% of the population. In terms of ancestry, 33.6% were German, 15.9% were Irish, 14.7% were English, and 4.9% were American.