 In terms of ancestry, 22.5% were German, 12.8% were English, 11.2% were Irish, 7.4% were American, 5.9% were Norwegian, 5.4% were Dutch, and 5.1% were Scottish.Of the 4,421 households, 29.7% had children under the age of 18 living with them, 55.0% were married couples living together, 7.6% had a female householder with no husband present, 32.7% were non-families, and 27.5% of all households were made up of individuals.The average household size was 2.47 and the average family size was 3.00.