sentences:  In terms of ancestry, 21.7% were German, 17.0% were American, 12.9% were Irish, and 10.8% were English.Of the 45,855 households, 29.5% had children under the age of 18 living with them, 45.7% were married couples living together, 14.1% had a female householder with no husband present, 36.0% were non-families, and 30.9% of all households were made up of individuals.The average household size was 2.33 and the average family size was 2.89.