 In terms of ancestry, 20.4% were German, 13.5% were English, 12.4% were Irish, and 9.0% were American.Of the 10,140 households, 38.6% had children under the age of 18 living with them, 56.6% were married couples living together, 9.4% had a female householder with no husband present, 29.6% were non-families, and 23.8% of all households were made up of individuals.The average household size was 2.60 and the average family size was 3.11.