 In terms of ancestry, 25.6% were German, 16.4% were Irish, 11.1% were American, 10.0% were English, 3.4% were Polish, 2.9% were Italian, 2.5% were French, 2.1% were Dutch and 1.9% were Scots-Irish.Of the 21,463 households, 25.5% had children under the age of 18 living with them, 41.8% were married couples living together, 9.9% had a female householder with no husband present, 44.3% were non-families, and 31.4% of all households were made up of individuals.The average household size was 2.30 and the average family size was 2.87.