As of the census of 2000, there were 6,389 people, 2,062 households, and 1,674 families living in the city. The population density was 217.5 people per square mile (84.0/km). There were 2,120 housing units at an average density of 72.2 per square mile (27.9/km). The racial makeup of the city was 97.26% White, 0.25% African American, 0.36% Native American, 0.72% Asian, 0.56% from other races, and 0.85% from two or more races. Hispanic or Latino of any race were 1.27% of the population. 41.0% were of German, 16.1% Norwegian, 7.0% Swedish, 6.9% Irish and 6.1% American ancestry according to Census 2000.