 In terms of ancestry, 18.9% were American, 16.8% were German, 13.2% were English, and 10.5% were Irish.Of the 8,262 households, 37.2% had children under the age of 18 living with them, 57.4% were married couples living together, 10.4% had a female householder with no husband present, 27.2% 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 3.19.