 35.0% were of German, 20.5% Norwegian, 6.0% English and 5.8% Swedish ancestry.There were 7,435 households out of which 29.30% had children under the age of 18 living with them, 61.10% were married couples living together, 7.10% had a female householder with no husband present, and 28.10% were non-families.24.20% of all households were made up of individuals and 11.30% had someone living alone who was 65 years of age or older.