 The population density was 78 people per square mile (30/km²).There were 20,189 housing units at an average density of 34 per square mile (13/km²).The racial makeup of the county was 97.56% White, 0.43% Black or African American, 0.35% Native American, 0.33% Asian, 0.01% Pacific Islander, 0.34% from other races, and 0.98% from two or more races.