 In terms of ancestry, 42.8% were German, 14.7% were Irish, 10.6% were English, and 8.6% were American.Of the 8,828 households, 31.9% had children under the age of 18 living with them, 56.4% were married couples living together, 9.7% had a female householder with no husband present, 29.5% were non-families, and 25.0% of all households were made up of individuals.The average household size was 2.51 and the average family size was 2.98.