 Of the 292,767 households, 24.4% had children under the age of 18 living with them, 27.1% were married couples living together, 16.3% had a female householder with no husband present, 52.0% were non-families, and 36.3% of all households were made up of individuals.The average household size was 2.30 and the average family size was 3.11.The median age was 31.5 years.