 In terms of ancestry, 27.5% were German, 10.5% were English, 9.4% were American, and 9.3% were Irish.Of the 8,311 households, 31.2% had children under the age of 18 living with them, 53.3% were married couples living together, 9.7% had a female householder with no husband present, 32.0% were non-families, and 27.2% of all households were made up of individuals.The average household size was 2.45 and the average family size was 2.95.