 The 2000 Census found 30.2 percent were of German, 14.3 percent Norwegian, 9.0 percent Swedish, 7.3 percent Irish and 5.9 percent Polish ancestry.There were 106,428 households out of which 39.90% had children under the age of 18 living with them, 60.70% were married couples living together, 9.80% had a female householder with no husband present, and 25.40% were non-families.Of all households, 19.30% were made up of individuals and 5.30% had someone living alone who was 65 years of age or older.