 In terms of ancestry, 30.6% were German, 17.4% were American, 11.7% were Irish, and 11.4% were English.Of the 4,377 households, 31.3% had children under the age of 18 living with them, 57.7% were married couples living together, 8.6% had a female householder with no husband present, 28.7% were non-families, and 24.3% of all households were made up of individuals.The average household size was 2.50 and the average family size was 2.95.