 Those of Hispanic or Latino origin made up 3.8% of the population.In terms of ancestry, 25.9% were German, 15.2% were Irish, 13.9% were English, 12.5% were American, and 6.7% were Norwegian.Of the 54,200 households, 32.8% had children under the age of 18 living with them, 53.9% were married couples living together, 10.0% had a female householder with no husband present, 31.2% were non-families, and 24.3% of all households were made up of individuals.