 44.3% were of German, 12.1% Norwegian, 7.1% Irish and 6.2% Swedish ancestry.There were 24,356 households out of which 45.20% had children under the age of 18 living with them, 66.40% were married couples living together, 7.30% had a female householder with no husband present, and 22.90% were non-families.18.10% of all households were made up of individuals and 6.10% had someone living alone who was 65 years of age or older.