sentences:  In terms of ancestry, 28.4% were German, 10.2% were Irish, 7.6% were English, and 7.6% were American.Of the 70,244 households, 38.1% had children under the age of 18 living with them, 53.9% were married couples living together, 12.6% had a female householder with no husband present, 28.0% were non-families, and 22.7% of all households were made up of individuals.The average household size was 2.76 and the average family size was 3.23.