sentences:  In terms of ancestry, 37.8% were German, 12.6% were English, 10.5% were Irish, and 8.2% were American.Of the 13,310 households, 30.4% had children under the age of 18 living with them, 54.3% were married couples living together, 9.3% had a female householder with no husband present, 31.2% were non-families, and 25.3% of all households were made up of individuals.The average household size was 2.47 and the average family size was 2.94.