 The population density was 4004.5 people per square mile (1,547.2/km2).There were 23,423 housing units at an average density of 1,722.3 per square mile (665.4/km2).The racial makeup of the city was 83.8% White, 7.3% Asian, 1.1% Black or African American, 0.69% Native American, 0.33% Hawaiian or Pacific Islander, 2.8% from other races, and 4.0% from two or more races.