As of the 2010 United States Census, there were 16,589 people, 6,548 households, and 4,643 families residing in the county. The population density was . There were 7,849 housing units at an average density of . The racial makeup of the county was 96.8% white, 0.7% black or African American, 0.6% American Indian, 0.2% Asian, 0.2% from other races, and 1.5% from two or more races. Those of Hispanic or Latino origin made up 0.6% of the population. In terms of ancestry, 23.4% were Germans, 22.3% were Americans, 13.6% were Irish people, and 11.0% were English people.. Which ancestral groups are at least 10%?