 In terms of ancestry, and 4.6% were American.Of the 13,007 households, 33.2% had children under the age of 18 living with them, 40.0% were married couples living together, 23.0% had a female householder with no husband present, 31.9% were non-families, and 29.0% of all households were made up of individuals.The average household size was 2.53 and the average family size was 3.13.