As of the 2010 United States Census, there were 12,705 people, 5,140 households, and 3,683 families living in the county. The population density was . There were 5,654 housing units at an average density of . The racial makeup of the county was 97.5% white, 0.6% black or African American, 0.3% American Indian, 0.2% Asian, 0.4% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 1.0% of the population. In terms of ancestry, 32.5% were German, 20.8% were American, 15.6% were Irish, and 14.3% were English.