 There are also independent agencies such as the United States Postal Service, the National Aeronautics and Space Administration (NASA), the Central Intelligence Agency (CIA), the Environmental Protection Agency (EPA), and the United States Agency for International Development (USAID).In addition, there are government-owned corporations such as the Federal Deposit Insurance Corporation (FDIC) and the National Railroad Passenger Corporation.There were 456 federal agencies in 2009.

, the Federal Government, excluding the Postal Service and soldiers, employed about 2 million civilian workers.