 In terms of ancestry, 17.6% were German, 11.5% were Irish, 10.9% were English, and 6.5% were American.Of the 4,584 households, 28.8% had children under the age of 18 living with them, 59.2% were married couples living together, 8.3% had a female householder with no husband present, 28.7% were non-families, and 25.3% of all households were made up of individuals.The average household size was 2.41 and the average family size was 2.85.