U.S. Department of Transportation
The Department of Transportation (DOT) is responsible for planning and coordinating federal transportation projects. It also sets safety regulations for all major modes of transportation.
Contact details
Main address
1200 New Jersey Ave., SE Washington, DC 20590
Use this address block when you need the main headquarters mailing address or the official contact page for U.S. Department of Transportation.
Largest component agencies in Transportation
This table shows the biggest component agencies or major organizational units reported under U.S. Department of Transportation in the latest OPM workforce summary.
| Agency | Employees | Total salary expense | Average pay | Share of department |
|---|---|---|---|---|
| Federal Aviation Administration | 46,335 | $6,649,118,835 | $143,501 | 81.0% |
| Federal Highway Administration | 2,967 | $388,282,389 | $130,867 | 5.2% |
| Office of the Secretary of Transportation | 1,916 | $275,879,092 | $143,987 | 3.3% |
| Federal Motor Carrier Safety Administration | 1,260 | $148,584,240 | $117,924 | 2.2% |
| Federal Railroad Administration | 1,193 | $158,867,038 | $133,166 | 2.1% |
| Maritime Administration | 814 | $105,933,146 | $130,139 | 1.4% |
| National Highway Traffic Safety Administration | 784 | $116,674,880 | $148,820 | 1.4% |
| Federal Transit Administration | 767 | $111,629,180 | $145,540 | 1.3% |
| Pipeline and Hazardous Materials Safety Administration | 652 | $90,891,408 | $139,404 | 1.1% |
| Office of Inspector General | 391 | $57,218,158 | $146,338 | 0.7% |
| Great Lakes Saint Lawrence Seaway Development Corporation | 125 | $11,686,875 | $93,495 | 0.2% |
Component agency counts use the latest OPM summary release for March 2025. A few very small units may be rounded or grouped in the source file.
Find an office near you
These are the office finder or locator tools linked by U.S. Department of Transportation on its official USAGov page. Use them if you need a field office, local service center, or regional contact point.
Other official contact routes
Contact details and office links come from the USA.gov agency directory. Workforce counts and average pay come from the latest OPM FedScope Employment Summary Data (March 2025).