 20.9% were of German, 11.7% English, 11.7% American, 9.6% Irish and 5.3% Norwegian ancestry.There were 14,693 households out of which 30.60% had children under the age of 18 living with them, 58.60% were married couples living together, 7.50% had a female householder with no husband present, and 30.10% were non-families.24.00% of all households were made up of individuals and 8.20% had someone living alone who was 65 years of age or older.