 As of the 2010 United States Census, there were 662,614 people, 224,840 households and 256,139 housing units in the county.The population density was 754.3 people per square mile.The racial makeup of the county was 75% White, 8.4% Black or African American, 0.7% Native American, 6.6% Asian, 0.1% Pacific Islander, and 2.9% from two or more races.