sentences:  In terms of ancestry, 40.3% were German, 11.3% were Irish, 9.4% were English, and 5.7% were American.Of the 12,314 households, 29.1% had children under the age of 18 living with them, 52.0% were married couples living together, 10.1% had a female householder with no husband present, 33.5% were non-families, and 28.9% of all households were made up of individuals.The average household size was 2.37 and the average family size was 2.90.