 The population density was 2,974.4 per square mile (1,148.4 square kilometers).There were 821,693 housing units at an average density of 1,342.5 per square mile (518.3 square kilometers).52.3% were White, 40.5% Black or African American, 2.5% Asian, 0.4% Native American, 0.8% of some other race and 2.4% of two or more races.