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- Air Traffic Service235
- Aircraft Development Service16
- Airports Service25
- Aviation Medicine Office227
- Coast Guard476
- Federal Aviation Administration1,177
- Federal Highway Administration445
- Federal Railroad Administration103
- Flight Standards Service84
- Motor Carrier Safety Bureau139
- Motor Carrier Safety Bureau (Terminated)1
- National Highway Safety Bureau221
- National Highway Traffic Safety Administration336
- National Transportation Safety Board480
- Public Roads Bureau143
- Railroad Safety Bureau53
- Safety Office101
- Saint Lawrence Seaway Development Corporation2
- St. Lawrence Seaway Development Corporation13
- Systems Research and Development Service347