 The population density was 469 people per square mile (181/km²).There were 161,135 housing units at an average density of 209 per square mile (81/km²).The racial makeup of the county was 63.96% White, 31.87% Black or African American, 0.39% Native American, 1.25% Asian, 0.04% Pacific Islander, 1.09% from other races, and 1.40% from two or more races.