As of the 2010 United States Census, there were 28,262 people, 10,850 households, and 7,799 families in the county. The population density was . There were 12,220 housing units at an average density of . The racial makeup of the county was 98.1% white, 0.3% Asian, 0.2% American Indian, 0.2% black or African American, 0.3% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 1.1% of the population. In terms of ancestry, 25.2% were German, 14.3% were American, 13.7% were Irish, and 9.6% were English.