As of the 2010 United States Census, there were 33,107 people, 13,869 households, and 9,359 families residing in the county. The population density was . There were 15,918 housing units at an average density of . The racial makeup of the county was 98.0% white, 0.5% black or African American, 0.4% Asian, 0.1% American Indian, 0.1% from other races, and 0.9% from two or more races. Those of Hispanic or Latino origin made up 0.8% of the population. In terms of ancestry, 26.2% were German, 17.6% were Irish, 13.0% were English, 9.6% were American, 7.0% were Polish, and 6.6% were Italian.