 There were 19,301 housing units at an average density of 721.0 per square mile (278.4/km²).The racial makeup of the city was 97.30% Caucasian, 0.64% African American, 0.05% Native American, 1.19% Asian, 0.03% Pacific Islander, 0.18% from other races, and 0.61% from two or more races.Hispanic or Latino of any race were 0.72% of the population.