 In terms of European ancestry, 23.7% were German, 17.5% were Irish, 14.6% were English, 7.1% were Norwegian, and 3.4% were American.Of the 3,837 households, 29.0% had children under the age of 18 living with them, 52.8% were married couples living together, 9.3% had a female householder with no husband present, 33.0% were non-families, and 27.3% of all households were made up of individuals.The average household size was 2.40 and the average family size was 2.90.