 In terms of ancestry, 13.4% were American, 8.4% were Irish, 6.2% were English, and 5.4% were German.Of the 11,974 households, 31.5% had children under the age of 18 living with them, 43.0% were married couples living together, 19.1% had a female householder with no husband present, 32.4% were non-families, and 29.0% of all households were made up of individuals.The average household size was 2.38 and the average family size was 2.90.