Based on the 2010 census, 85.2% of the population is Caucasian, 4.7% is African-American, 0.4% is American Indian and Alaska Native, and 4.4% is Asian. Hispanics and Latinos consist 6% of the population.  The county had a total population of 398,552 with an average of 36.8 years.  69.5% were family households and 30.5% were non-family households.