 Those of Hispanic or Latino origin made up 3.5% of the population.In terms of ancestry, 31.5% were German, 16.3% were Irish, 11.8% were English, 7.5% were American, 6.2% were Norwegian, and 5.1% were Polish.Of the 12,360 households, 27.5% had children under the age of 18 living with them, 49.8% were married couples living together, 8.4% had a female householder with no husband present, 37.7% were non-families, and 30.9% of all households were made up of individuals.