 In terms of ancestry, 11.7% were German, 9.1% were Irish, 7.6% were English, 6.3% were Italian, and 2.7% were American.Of the 715,365 households, 34.9% had children under the age of 18 living with them, 45.0% were married couples living together, 13.5% had a female householder with no husband present, 34.6% were non-families, and 25.3% of all households were made up of individuals.The average household size was 2.70 and the average family size was 3.26.