 In terms of ancestry, 22.4% were German, 19.0% were English, 13.0% were Irish, 7.4% were Italian, and 4.4% were American.Of the 16,475 households, 36.7% had children under the age of 18 living with them, 53.5% were married couples living together, 9.0% had a female householder with no husband present, 30.8% were non-families, and 24.0% of all households were made up of individuals.The average household size was 2.62 and the average family size was 3.09.