There were 17,787 households, of which 33.5% had children under the age of 18 living with them, 48.5% were married couples living together, 11.7% had a female householder with no husband present, 4.5% had a male householder with no wife present, and 35.3% were non-families. 29.7% of all households were made up of individuals, and 11.5% had someone living alone who was 65 years of age or older. The average household size was 2.43 and the average family size was 3.00.