 In terms of ancestry, 19.6% were American, 13.8% were German, 9.5% were English, and 9.4% were Irish.Of the 4,076 households, 36.9% had children under the age of 18 living with them, 57.3% were married couples living together, 9.6% had a female householder with no husband present, 27.5% were non-families, and 23.0% of all households were made up of individuals.The average household size was 2.79 and the average family size was 3.29.