 67.1% were of German and 9.6% Norwegian ancestry.There were 10,598 households out of which 31.50% had children under the age of 18 living with them, 57.30% were married couples living together, 6.90% had a female householder with no husband present, and 32.40% were non-families.29.00% of all households were made up of individuals and 14.30% had someone living alone who was 65 years of age or older.