| Carrier Code | Carrier Name |
| UNOU | UNITEAM A/S |
| UNPU | UNI-PACIFIC CONTAINER LINES LTD |
| UNSG | UNISHIPPING MARITIME SERVICES |
| UNSU | UNISON SHIPPING CO LTD |
| UNUU | UNISHIPPING |
| UPCU | USPCCI |
| UPFU | UNION PACIFIC BULKTAINER SERVICE (LEASED FROM SECURITY PACIFIC |
| UPRM | UPPER MISSOURI RIVER CORPORATION |
| UPRU | UNION PACIFIC RAILROAD COMPANY |
| UPTU | UNION PACIFIC BULKTAINER SERVICE (LEASED FROM 1ST SECURITY BANK OF UT |
| UPUU | UNION PACIFIC BULKTAINER SERVICE (LEASED FROM EUROTAINER & |
| URGP | URGUP DENIZCILIK TICARET LIMITED SIRKETI |
| USAK | USA TRUCKING CORP |
| USAU | U S DEPARTMENT OF DEFENSE-ARMY |
| USCU | UNION STEAMSHIP CO/NEW ZEALAND LTD |
