There were 19,799 households, of which 36.0% had children under the age of 18 living with them, 26.9% were married couples living together, 28.7% had a female householder with no husband present, 6.3% had a male householder with no wife present, and 38.1% were non-families. 32.1% 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 2.52 and the average family size was 3.19.