 38.5% were of German, 24.6% Norwegian and 8.1% Swedish ancestry.There were 13,276 households out of which 29.90% had children under the age of 18 living with them, 59.00% were married couples living together, 6.40% had a female householder with no husband present, and 32.00% were non-families.26.50% of all households were made up of individuals and 12.30% had someone living alone who was 65 years of age or older.