sentences:  In terms of ancestry, 27.8% were German, 19.2% were Irish, 14.9% were English, and 12.7% were American.Of the 4,216 households, 30.5% had children under the age of 18 living with them, 52.8% were married couples living together, 9.2% had a female householder with no husband present, 32.8% were non-families, and 28.7% of all households were made up of individuals.The average household size was 2.43 and the average family size was 2.98.