 In terms of ancestry, 51.7% were German, 11.7% were Irish, 11.5% were Czech, 10.9% were Norwegian, 6.2% were English, and 1.3% were American.Of the 2,136 households, 30.3% had children under the age of 18 living with them, 52.0% were married couples living together, 8.6% had a female householder with no husband present, 35.6% were non-families, and 30.5% of all households were made up of individuals.The average household size was 2.40 and the average family size was 3.03.