 30.6% were of English, 10.7% German, 10.2% American and 5.3% Danish ancestry.There were 7,129 households out of which 39.00% had children under the age of 18 living with them, 60.10% were married couples living together, 5.70% had a female householder with no husband present, and 31.90% were non-families.12.70% of all households were made up of individuals and 5.60% had someone living alone who was 65 years of age or older.