 In terms of ancestry, 17.8% were American, 8.7% were English, 8.2% were Irish, and 8.0% were German.Of the 27,547 households, 32.9% had children under the age of 18 living with them, 44.4% were married couples living together, 17.5% had a female householder with no husband present, 33.1% were non-families, and 27.9% of all households were made up of individuals.The average household size was 2.43 and the average family size was 2.96.