sentences:  Of the 42,331 households, 31.0% had children under the age of 18 living with them, 48.3% were married couples living together, 12.8% had a female householder with no husband present, 33.3% were non-families, and 27.3% of all households were made up of individuals.The average household size was 2.48 and the average family size was 3.00.The median age was 39.6 years.