 In terms of ancestry, 42.9% were German, 8.2% were Irish, 7.9% were American, and 6.9% were English.Of the 12,011 households, 36.3% had children under the age of 18 living with them, 59.4% were married couples living together, 8.9% had a female householder with no husband present, 27.8% were non-families, and 24.6% of all households were made up of individuals.The average household size was 2.83 and the average family size was 3.41.