sentences:  In terms of ancestry, 32.3% were German, 18.3% were American, 11.7% were Irish, and 9.4% were English.Of the 74,454 households, 28.9% had children under the age of 18 living with them, 42.9% were married couples living together, 13.1% had a female householder with no husband present, 39.4% were non-families, and 32.3% of all households were made up of individuals.The average household size was 2.31 and the average family size was 2.93.