The United States Department of Transportation employs almost 60,000 people across the country in the Office of the Secretary of Transportation and its operating administrations and bureaus each with its own management and organizational structure:
Office of the Secretary of Transportation
National Highway Traffic Safety Administration
Federal Aviation Administration
Office of Inspector General
Federal Highway Administration
Pipeline and Hazardous Materials Safety Administration
Federal Motor Carrier Safety Administration
Research and Innovative Technology Administration
Federal Railroad Administration
Saint Lawrence Seaway Development Corporation
Federal Transit Administration
Surface Transportation Board
Maritime Administration