As of the census of 2000, there were 20,059 people, 6,687 households, and 5,329 families living in the city. The population density was 1,189.4 people per square mile (459.1/km). There were 7,001 housing units at an average density of 415.1 per square mile (160.2/km). The racial makeup of the city was 95.80% White, 1.35% African American, 0.06% Native American, 2.45% Asian, 0.13% Pacific Islander, 0.44% from other races, and 0.77% from two or more races. Hispanic or Latino of any race were 0.87% of the population.