 The population density was 405 people per square mile (156/km²).The 115,991 housing units averaged 133 per square mile (51/km²).The racial or ethnic makeup of the county was 56.96% White (46.21% White non-Hispanic), 19.85% Black or African American, 0.30% Native American, 11.20% Asian, 0.04% Pacific Islander, 9.10% from other races, and 2.56% from two or more races.