 In terms of ancestry, 13.5% were English, 9.0% were Irish, 8.7% were American, and 7.6% were German.Of the 24,524 households, 29.1% had children under the age of 18 living with them, 50.8% were married couples living together, 15.6% had a female householder with no husband present, 29.5% were non-families, and 25.4% of all households were made up of individuals.The average household size was 2.43 and the average family size was 2.89.