Oklahoma | United States Department of Defense | United States Department of State | United States Department of Justice | United States Department of Agriculture | Oklahoma City | Tulsa, Oklahoma | United States Department of Energy | University of Oklahoma | United States Department of War | United States Department of Veterans Affairs | United States Department of the Treasury | War Department | Los Angeles Police Department | United States Department of Transportation | Beni Department | Department of Energy | United States Department of Labor | Cochabamba Department | United States Department of Health and Human Services | Bombardier Transportation | United States Department of Education | Antioquia Department | United States Department of the Interior | Oklahoma! | Norman, Oklahoma | United States Department of Housing and Urban Development | United States Department of Homeland Security | New York City Fire Department | Southern Pacific Transportation Company |
Historically, the Secretary of Transportation has also served as either the Director of the Oklahoma Department of Transportation or as the Director of the Oklahoma Turnpike Authority.