sentences:  There were 12,146 households out of which 31.30% had children under the age of 18 living with them, 52.70% were married couples living together, 12.90% had a female householder with no husband present, and 29.90% were non-families.25.70% of all households were made up of individuals and 10.70% had someone living alone who was 65 years of age or older.The average household size was 2.50 and the average family size was 3.01.