As of the 2000 United States Census, there were 70,205 people, 24,356 households, and 18,778 families in the county. The population density was 198/sqmi (76.6/km2). There were 24,883 housing units at an average density of 70.3/sqmi (27.1/km2). The racial makeup of the county was 95.95% White, 0.59% Black or African American, 0.18% Native American, 1.56% Asian, 0.01% Pacific Islander, 0.87% from other races, and 0.82% from two or more races. 2.55% of the population were Hispanic or Latino of any race. 44.3% were of German, 12.1% Norwegian, 7.1% Irish and 6.2% Swedish ancestry.