 Of the 11,923 households, 36.5% had children under the age of 18 living with them, 40.2% were married couples living together, 23.9% had a female householder with no husband present, 30.0% were non-families, and 26.5% of all households were made up of individuals.The average household size was 2.65 and the average family size was 3.20.The median age was 36.7 years.