As of the census of 2000, there were 18,510 people, 5,906 households, and 5,102 families living in the city. The population density was 642.9 people per square mile (248.2/km). There were 5,946 housing units at an average density of 206.5 per square mile (79.7/km). The racial makeup of the city was 96.80% White, 0.31% African American, 0.45% Native American, 0.01% Asian, 0.01% Pacific Islander, 0.28% from other races, and 1.15% from two or more races. Hispanic or Latino of any race were 1.19% of the population.