 There were 18,166 housing units at an average density of 20 per square mile (8/km²).The racial makeup of the county was 98.3% White, 0.52% Black or African American, 0.1% Native American, 0.4% Asian, <0.1% Pacific Islander, 0.2% from other races, and 0.5% from two or more races.0.5% of the population were Hispanic or Latino of any race.