 In terms of ancestry, 18.8% were American, 17.4% were German, 13.0% were English, and 8.8% were Irish.Of the 63,604 households, 42.7% had children under the age of 18 living with them, 56.7% were married couples living together, 12.3% had a female householder with no husband present, 25.3% were non-families, and 20.1% of all households were made up of individuals.The average household size was 2.92 and the average family size was 3.36.