 The population density was 9,601.9 people per square mile (3,725.7/km2).There were 4,674 housing units at an average density of 5,603.6 per square mile (2,174.3/km2).The racial makeup of the city was 98.8% White, 0.1% African American, 0.1% Native American, 0.3% Asian, 0.0% Pacific Islander, 0.1% from other races, and 0.5% from two or more races.