As of the census of 2000, there were 51,301 people, 21,393 households, and 14,097 families living in the city. The population density was 1,893.0 persons per square mile (729.7/km). There were 22,228 housing units at an average density of 818.9 per square mile (316.2/km). The racial makeup of the city was 94.40% White, 1.50% African American, 0.20% Native American, 2.29% Asian, 0.03% Pacific Islander, 0.57% from other races, and 1.03% from two or more races. Hispanic or Latino of any race were 1.28% of the population. 24.7% were of German, 13.8% Norwegian, 9.1% Irish, 8.2% Swedish and 6.7% English ancestry.