 0.88% of the population were Hispanic or Latino of any race.39.2% were of German, 23.2% Norwegian and 5.7% Irish ancestry.There were 10,665 households out of which 28.60% had children under the age of 18 living with them, 49.00% were married couples living together, 6.60% had a female householder with no husband present, and 41.70% were non-families.