As of the 2010 United States Census, there were 40,097 people, 15,329 households, and 10,925 families living in the county. The population density was . There were 16,755 housing units at an average density of . The racial makeup of the county was 94.7% white, 2.2% black or African American, 0.4% Asian, 0.4% American Indian, 0.4% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population. In terms of ancestry, 27.6% were German, 14.9% were Irish, 14.3% were American, and 11.8% were English.