As of the 2000 United States Census, there were 20,735 people, 9,709 households, and 5,437 families residing in the city. The population density was 4,360.8 people per square mile (1,685.4/km). There were 10,166 housing units at an average density of 2,138.0 per square mile (826.3/km). The racial makeup of the city was 96.83% White, 0.41% African American, 0.07% Native American, 1.33% Asian, 0.02% Pacific Islander, 0.27% from other races, and 1.08% from two or more races. Hispanic or Latino of any race were 1.20% of the population.