 1.77% of the population were Hispanic or Latino of any race.47.6% were of German, 13.6% Norwegian and 6.5% Irish ancestry.There were 21,062 households, of which 29.10% had children under the age of 18 living with them, 48.60% were married couples living together, 7.80% had a female householder with no husband present, and 40.10% were non-families.