 The population density was 355.4 per square mile (137.2/km²).There were 168,199 housing units at an average density of 163.7 per square mile (63.2/km²).The racial makeup of the county was 95.3% White, 2.3% Black or African American, 0.1% Native American, 0.7% Asian, 0.03% Pacific Islander, 0.2% from other races, and 1.2% from two or more races.