As of the 2010 United States Census, there were 800,647 people residing in the county.
In the county, the population was spread out with 32.00% under the age of 18, 10.60% from 18 to 24, 29.30% from 25 to 44, 18.40% from 45 to 64, and 9.70% who were 65 years of age or older.