 In terms of ancestry, 25.9% were German, 22.4% were English, 13.0% were Irish, 9.9% were American, and 6.2% were Swedish.Of the 3,576 households, 22.9% had children under the age of 18 living with them, 52.7% were married couples living together, 6.9% had a female householder with no husband present, 36.6% were non-families, and 31.7% of all households were made up of individuals.The average household size was 2.20 and the average family size was 2.74.