sentences:  In terms of ancestry, 13.4% were German, 8.1% were English, 8.0% were Irish, and 4.4% were American.Of the 24,464 households, 33.3% had children under the age of 18 living with them, 50.2% were married couples living together, 12.7% had a female householder with no husband present, 32.0% were non-families, and 27.1% of all households were made up of individuals.The average household size was 2.51 and the average family size was 3.05.