sentences:  In terms of ancestry, 17.0% were German, 14.1% were English, 12.7% were American, and 9.8% were Irish.Of the 7,102 households, 28.7% had children under the age of 18 living with them, 55.1% were married couples living together, 9.1% had a female householder with no husband present, 31.7% were non-families, and 28.4% of all households were made up of individuals.The average household size was 2.35 and the average family size was 2.86.