There were 18,195 households, of which 30.0% had children under the age of 18 living with them, 58.9% were married couples living together, 6.8% had a female householder with no husband present, 3.2% had a male householder with no wife present, and 31.1% were non-families. 24.9% of all households were made up of individuals, and 8% had someone living alone who was 65 years of age or older. The average household size was 2.47 and the average family size was 2.98.