Passage: There were 12,961 households of which 40.20% had children under the age of 18 living with them, 58.00% were married couples living together, 15.20% had a female householder with no husband present, and 22.10% were non-families. 19.70% of all households were made up of individuals and 9.50% had someone living alone who was 65 years of age or older. The average household size was 2.99 and the average family size was 3.45.

Question: How many households were surveyed?
12,961 households