 The population density was 51.9 per square mile (20.0 square kilometers).There were 15,944 housing units at an average density of 31.1 per square mile (12.0 square kilometers).The racial and ethnic makeup of the county was 83.7% White, 0.4% Black or African American, 0.8% Native American, 0.2% Asian, 13.7% Hispanic or Latino, 0.1% from other races, and 1.2% from two or more races.