In the county, the population was spread out with 32.00% under the age of 18, 17.90% from 18 to 24, 33.90% from 25 to 44, 12.20% from 45 to 64, and 3.90% who were 65 years of age or older.
Of the 22,155 households, 45.9% had children under the age of 18 living with them, 49.0% were married couples living together, 21.5% had a female householder with no husband present, 25.2% were non-families, and 20.7% of all households were made up of individuals.