As of the 2010 United States Census, 28,550 people, 11,147 households, and 7,793 families resided in the county. The population density was . There were 12,978 housing units at an average density of . The racial makeup of the county was 97.7% white, 0.4% American Indian, 0.3% black or African American, 0.1% Asian, 0.2% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 0.9% of the population. In terms of ancestry, 17.6% were German, 16.5% were American, 15.3% were Irish, and 9.8% were English.