 In terms of ancestry, 14.7% were American, 9.7% were Irish, 6.6% were English, and 6.5% were German.Of the 21,519 households, 35.1% had children under the age of 18 living with them, 46.2% were married couples living together, 17.4% had a female householder with no husband present, 30.6% were non-families, and 25.8% of all households were made up of individuals.The average household size was 2.54 and the average family size was 3.03.