 The population density was 595 people per square mile (230/km2).There were 288,162 housing units at an average density of 259 per square mile (100/km2).The racial makeup of the county was 58.10% White, 39.36% Black or African American, 0.21% Native American, 0.90% Asian, 0.03% Pacific Islander, 0.59% from other races, and 0.80% from two or more races.