As of the 2010 United States Census, there were 37,642 people, 15,075 households, and 10,260 families living in the county. The population density was . There were 16,668 housing units at an average density of . The racial makeup of the county was 95.9% white, 1.0% black or African American, 0.6% Asian, 0.2% American Indian, 1.1% from other races, and 1.2% from two or more races. Those of Hispanic or Latino origin made up 3.7% of the population. In terms of ancestry, 46.1% were German, 12.0% were Irish, 10.7% were English, and 7.8% were American.