sentences:  In terms of ancestry, 10.9% were German, 6.7% were English, 6.1% were Irish, and 4.2% were American.Of the 27,500 households, 37.1% had children under the age of 18 living with them, 51.8% were married couples living together, 13.9% had a female householder with no husband present, 27.4% were non-families, and 22.1% of all households were made up of individuals.The average household size was 2.73 and the average family size was 3.18.