sentences:  The population density was 806 people per square mile (311/km²).There were 79,616 housing units at an average density of 400 per square mile (155/km²).The racial makeup of the county was 79.91% White, 16.97% Black or African American, 0.39% Native American, 0.83% Asian, 0.06% Pacific Islander, 0.79% from other races, and 1.05% from two or more races.