| Carrier Code | Carrier Name |
| USDU | UNISPEED LTD |
| USFU | U S DEPARTMENT OF DEFENSE-AIR FORCE |
| USLU | UNITED STATES LINES INC |
| USMT | U S A MARITIME ENTERPRISES INC |
| USNU | U S DEPARTMENT OF DEFENSE-NAVY |
| USSU | UNITED STEEL & STRIP CORP |
| USTU | UNITED STATES INSTITUTE FOR THEATRE TECHNOLOGY INC, THE |
| UTCU | UNITED TANK CONTAINER |
| UTMU | UNITED MARINE LINES INC |
| UTNU | UNIVERSAL TRANSCONTINENTAL CORP |
| UTTU | UNITED TRANSPORT TANKCONTAINERS BV |
| UTWC | UNITED TOWING CO |
| UUUU | UITERWYK CORPORATION |
| UUVS | UNITED UNIVERSE INC |
| UVML | UNIVERSITY MARITIME LIMITED |
