There were 17,659 households, of which 31.5% had children under the age of 18 living with them, 60.5% were married couples living together, 7.4% had a female householder with no husband present, 3.2% had a male householder with no wife present, and 28.9% were non-families. 24.9% of all households were made up of individuals, and 10.9% had someone living alone who was 65 years of age or older. The average household size was 2.52 and the average family size was 3.04.