As of the 2010 United States Census, there were 30,097 people, 12,057 households, and 8,437 families residing in the county. The population density was . There were 18,854 housing units at an average density of . The racial makeup of the county was 97.8% white, 1.0% black or African American, 0.3% Asian, 0.1% American Indian, 0.1% from other races, and 0.7% from two or more races. Those of Hispanic or Latino origin made up 0.7% of the population. In terms of ancestry, 35.4% were German, 13.6% identified as American, 11.3% were Irish, and 11.3% were English.