As of the census of 2010, there were 20,413 people, 7,731 households, and 5,864 families residing in the city. The population density was 1,673.2 people per square mile (643.9/km). There were 8,266 housing units at an average density of 675.8 per square mile (260.8/km). The racial makeup of the city was 97.2% White, 1.0% Black or African American, 0.1% Native American, 0.9% Asian, 0.0% Pacific Islander, 0.2% from other races, and 0.6% from two or more races. 1.0% of the population were Hispanic or Latino of any race.