As of the 2010 United States Census, there were 42,040 people, 16,210 households, and 11,364 families residing in the county. The population density was . There were 18,133 housing units at an average density of . The racial makeup of the county was 94.7% white, 2.2% black or African American, 0.5% Asian, 0.2% American Indian, 0.5% from other races, and 1.9% from two or more races. Those of Hispanic or Latino origin made up 1.3% of the population. In terms of ancestry, 26.4% were Germans, 15.4% were Irish people, 12.0% were Americans, and 11.9% were English people.

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