As of the 2010 United States Census, there were 74,782 people, 30,197 households, and 19,884 families living in the county. The population density was . There were 33,174 housing units at an average density of . The racial makeup of the county was 93.4% white, 1.7% Asian, 1.5% black or African American, 0.2% American Indian, 1.4% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 4.5% of the population. In terms of ancestry, 43.1% were German, 11.0% were Irish, 10.3% were English, and 6.6% were American.
