As of the 2000 United States Census there were 5,920 people, 2,371 households, and 1,707 families in the county. Since 2000, however, an oil boom has increased the population significantly. The population density was 1.2 person per square mile (0.5/km2). There were 3,552 housing units at an average density of 0.7 per square mile (0.3/km2). The racial makeup of the county was 97.48% White, 0.20% Black or African American, 0.49% Native American, 0.24% Asian, 0.08% Pacific Islander, 0.52% from other races, and 0.98% from two or more races. 1.89% of the population were Hispanic or Latino of any race. 21.7% were of German, 17.5% English, 11.0% American and 10.1% Irish ancestry.