There were 19,288 households, of which 33.7% had children under the age of 18 living with them, 55.3% were married couples living together, 9.0% had a female householder with no husband present, 3.4% had a male householder with no wife present, and 32.3% were non-families. 25.2% of all households were made up of individuals, and 7.3% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.00.