 42.3% were of German, 11.9% Norwegian, 7.4% Swedish and 6.6% Irish ancestry.There were 31465 households out of which 42.10% had children under the age of 18 living with them, 64.50% were married couples living together, 7.70% had a female householder with no husband present, and 24.00% were non-families.18.80% of all households were made up of individuals and 6.80% had someone living alone who was 65 years of age or older.