As of the 2000 United States Census, there were 21,659 people, 9,823 households, and 5,825 families residing in the city. The population density was 5,158.6 people per square mile (1,991.1/km). There were 10,263 housing units at an average density of 2,444.4 per square mile (943.5/km). The racial makeup of the city was 94.76% White, 1.17% African American, 0.13% Native American, 2.33% Asian, 0.01% Pacific Islander, 0.45% from other races, and 1.15% from two or more races. Hispanic or Latino of any race were 1.62% of the population.