 Those of Hispanic or Latino origin made up 3.0% of the population.In terms of ancestry, 40.9% were German, 16.6% were Irish, 15.7% were Norwegian, 10.4% were English, and 5.2% were American.Of the 4,160 households, 30.5% had children under the age of 18 living with them, 52.3% were married couples living together, 9.8% had a female householder with no husband present, 33.0% were non-families, and 28.5% of all households were made up of individuals.