 In terms of ancestry, 19.9% were American, 7.5% were Irish, 5.6% were English, and 5.1% were German.Of the 12,876 households, 34.1% had children under the age of 18 living with them, 44.5% were married couples living together, 19.8% had a female householder with no husband present, 29.5% were non-families, and 25.9% of all households were made up of individuals.The average household size was 2.56 and the average family size was 3.04.