 1.15% of the population were Hispanic or Latino of any race.31.3% were of German, 18.1% Swedish, 11.3% Norwegian and 6.9% Irish ancestry.There were 14,454 households out of which 41.00% had children under the age of 18 living with them, 64.50% were married couples living together, 8.00% had a female householder with no husband present, and 23.30% were non-families.