 Of the 18,173 households, 34.7% had children under the age of 18 living with them, 44.6% were married couples living together, 18.3% had a female householder with no husband present, 31.2% were non-families, and 27.4% of all households were made up of individuals.The average household size was 2.52 and the average family size was 3.05.The median age was 39.3 years.