As of the census of 2000, there were 18,204 people, 6,642 households, and 4,722 families residing in the city. The population density was 1,798.2 people per square mile (694.5/km2 ). There were 6,758 housing units at an average density of 667.6 per square mile (257.8/km2). The racial makeup of the city was 97.16% White, 0.43% African American, 0.38% Native American, 0.64% Asian, 0.04% Pacific Islander, 0.36% from other races, and 0.99% from two or more races. Hispanic or Latino of any race were 1.14% of the population.