As of the census of 2000, there were 21,340 people, 9,281 households, and 6,004 families residing in the city. The population density was 3,904.6 people per square mile (1,508.8/km2). There were 10,556 housing units at an average density of 1,934.1 per square mile (747.4/km2). The racial makeup of the city was 92.7% White, 0.82% African American, 0.16% Native American, 0.65% Asian, 0.64% Pacific Islander, 2.76% from other races, and 0.89% from two or more races. Hispanic or Latino of any race were 2.15% of the population.