 18.8% were of German, 11.3% American, 10.7% Czech and 6.2% Irish ancestry according to Census 2000.There were 6,363 households out of which 31.90% had children under the age of 18 living with them, 56.40% were married couples living together, 11.40% had a female householder with no husband present, and 28.10% were non-families.24.90% of all households were made up of individuals and 12.40% had someone living alone who was 65 years of age or older.