 50.8% were of German, 10.1% Norwegian, 5.5% Irish and 5.4% American ancestry.There were 7,585 households out of which 31.10% had children under the age of 18 living with them, 51.40% were married couples living together, 8.20% had a female householder with no husband present, and 37.10% were non-families.30.80% of all households were made up of individuals and 13.40% had someone living alone who was 65 years of age or older.