As of the 2010 United States Census, there were 37,124 people, 14,218 households, and 10,074 families in the county. The population density was . There were 15,805 housing units at an average density of . The racial makeup of the county was 97.1% white, 0.4% Asian, 0.4% American Indian, 0.4% black or African American, 0.5% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 1.7% of the population. In terms of ancestry, 37.9% were German, 14.9% were Irish, 12.9% were American, and 12.1% were English.