 0.67% of the population were Hispanic or Latino of any race.55.0% were of German and 12.7% of Norwegian ancestry.There were 14,638 households out of which 29.60% had children under the age of 18 living with them, 52.80% were married couples living together, 7.90% had a female householder with no husband present, and 36.30% were non-families.