sentences:  In terms of ancestry, 26.9% were German, 19.9% were American, 13.0% were Irish, and 9.1% were English.Of the 15,249 households, 29.1% had children under the age of 18 living with them, 48.5% were married couples living together, 11.1% had a female householder with no husband present, 36.2% were non-families, and 30.1% of all households were made up of individuals.The average household size was 2.35 and the average family size was 2.90.