 28.2% were of German, 15.0% Norwegian, 7.3% Swedish, 6.1% Irish and 6.1% American ancestry.There were 10,893 households out of which 27.70% had children under the age of 18 living with them, 58.40% were married couples living together, 8.00% had a female householder with no husband present, and 29.00% were non-families.25.00% of all households were made up of individuals and 11.90% had someone living alone who was 65 years of age or older.