As of the census of 2000, there were 18,132 people, 6,904 households, and 4,957 families residing in the county. The population density was 38 people per square mile (15/km2). There were 7,815 housing units at an average density of 16 per square mile (6/km2). The racial makeup of the county was 98.21% White, 0.18% Black or African American, 0.23% Native American, 0.65% Asian, 0.03% Pacific Islander, 0.12% from other races, and 0.58% from two or more races. Approximately 0.51% of the population were Hispanic or Latino of any race.