 The population density was 1,553 people per square mile (599/km²).The 297,434 housing units averaged 238 units/km² (616 units/sq mi).The racial makeup of the county was 86.46% White, 7.46% Black or African American, 0.11% Native American, 4.02% Asian, 0.03% Pacific Islander, 0.75% from other races, and 1.16% from two or more races.