 In terms of ancestry, 34.1% were German, 15.3% were Irish, 13.6% were English, and 13.6% were American.Of the 18,065 households, 40.8% had children under the age of 18 living with them, 62.8% were married couples living together, 8.7% had a female householder with no husband present, 24.3% were non-families, and 19.5% of all households were made up of individuals.The average household size was 2.73 and the average family size was 3.14.