There were 12,256 households, of which 34.6% had children under the age of 18 living with them, 48.7% were married couples living together, 13.2% had a female householder with no husband present, 4.4% had a male householder with no wife present, and 33.7% were non-families. 28.7% of all households were made up of individuals, and 9.5% had someone living alone who was 65 years of age or older. The average household size was 2.55, and the average family size was 3.15.