 In terms of ancestry, 26.4% were German, 15.4% were Irish, 12.0% were American, and 11.9% were English.Of the 16,210 households, 33.5% had children under the age of 18 living with them, 52.9% were married couples living together, 11.9% had a female householder with no husband present, 29.9% were non-families, and 25.1% of all households were made up of individuals.The average household size was 2.52 and the average family size was 2.99.