As of the 2010 United States Census, there were 15,014 people residing in the county.
In the county, the population was spread out with 24.60% under the age of 18, 5.30% from 18 to 24, 25.20% from 25 to 44, 28.50% from 45 to 64, and 16.40% who were 65 years of age or older.