 In terms of ancestry, 12.2% were American, 6.8% were Irish, and 5.0% were English.Of the 13,132 households, 31.7% had children under the age of 18 living with them, 45.1% were married couples living together, 20.6% had a female householder with no husband present, 29.7% were non-families, and 26.1% of all households were made up of individuals.The average household size was 2.54 and the average family size was 3.04.