 In terms of ancestry, 41.6% were German, 10.0% were Irish, 9.3% were American, and 8.8% were English.Of the 13,515 households, 32.7% had children under the age of 18 living with them, 54.9% were married couples living together, 9.5% had a female householder with no husband present, 31.2% were non-families, and 26.9% of all households were made up of individuals.The average household size was 2.50 and the average family size was 3.03.