 23.6% were of English, 12.5% American, 8.9% German and 5.1% Danish ancestry.There were 13,317 households out of which 44.60% had children under the age of 18 living with them, 66.70% were married couples living together, 9.80% had a female householder with no husband present, and 19.60% were non-families.17.10% of all households were made up of individuals and 7.70% had someone living alone who was 65 years of age or older.