sentences:  In terms of ancestry, 29.1% were German, 18.5% were Irish, 10.1% were Polish, 9.7% were English, 5.8% were Italian, and 5.6% were American.Of the 61,998 households, 34.1% had children under the age of 18 living with them, 55.7% were married couples living together, 10.4% had a female householder with no husband present, 29.2% were non-families, and 23.3% of all households were made up of individuals.The average household size was 2.60 and the average family size was 3.07.