 In terms of ancestry, 34.0% were German, 19.1% were Irish, 14.4% were English, 8.5% were Italian, 7.2% were Polish, and 5.7% were American.Of the 18,914 households, 24.6% had children under the age of 18 living with them, 43.4% were married couples living together, 11.7% had a female householder with no husband present, 40.9% were non-families, and 35.3% of all households were made up of individuals.The average household size was 2.21 and the average family size was 2.86.