 Of the 13,558 households, 33.4% had children under the age of 18 living with them, 55.4% were married couples living together, 11.5% had a female householder with no husband present, and 29.2% were not families.About 24.8% of all households were made up of individuals, and 12.0% had someone living alone who was 65 years of age or older.The average household size was 2.60 and the average family size was 3.11.