 In terms of ancestry, 31.7% were German, 16.3% were English, 15.4% were Irish, and 6.3% were American.Of the 11,885 households, 26.1% had children under the age of 18 living with them, 54.9% were married couples living together, 7.2% had a female householder with no husband present, 34.6% were non-families, and 28.5% of all households were made up of individuals.The average household size was 2.29 and the average family size was 2.81.