 The population density was 31.7 per square mile (12.2 per km²).There were 20,214 housing units at an average density of 17.3 per square mile (6.7 per km²).94.7% of the population were White, 2.4% Native American, 0.4% Asian, 0.2% Black or African American, 0.2% of some other race and 2.1% of two or more races.