There were 18,580 households, of which 31.3% had children under the age of 18 living with them, 44.1% were married couples living together, 13.9% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 37.0% were non-families. 30.5% of all households were made up of individuals, and 9.2% had someone living alone who was 65 years of age or older. The average household size was 2.37 and the average family size was 2.95.