 25.1% were of German, 11.3% English, 11.0% American, 8.9% Irish and 5.6% Norwegian ancestry.There were 15,286 households out of which 29.00% had children under the age of 18 living with them, 52.80% were married couples living together, 9.30% had a female householder with no husband present, and 33.60% were non-families.26.70% of all households were made up of individuals and 11.30% had someone living alone who was 65 years of age or older.