sentences:  In terms of ancestry, 10.1% were German, 9.3% were Irish, 8.5% were English, and 4.6% were American.Of the 23,691 households, 37.7% had children under the age of 18 living with them, 48.9% were married couples living together, 14.9% had a female householder with no husband present, 29.7% were non-families, and 25.2% of all households were made up of individuals.The average household size was 2.70 and the average family size was 3.22.