| 3601 | MHFS | M & H FASTLINE | | | SCAC4 |
| 3602 | MHFT | MISSION HILL FAMILY ESTATE | | | SCAC4 |
| 3603 | MHFU | MHF SERVICES | | USA | BIC |
| 3604 | MHFU | MHF Services | | | RSRV |
| 3605 | MHFU | MHF LOGISTICAL SOLUTIONS | | | SCAC4 |
| 3606 | MHFX | MHF Logistical Solutions Inc. | added 10/1998; 7/2000-7/2005 | | NAKINA |
| 3607 | MHFX | Mount Hope Finishing Co. | 8/1920 | | NAKINA |
| 3608 | MHFX | MHF Logistical Solutions Inc. | added 10/98; 7/2000 | | NRHS |
| 3609 | MHFX | *MOUNT HOPE FINISHING CO. | | | PWRC |
| 3610 | MHFX | +MHF LOGISTICAL SOLUTIONS INC. | | | PWRC |
| 3611 | MHFX | MHF Logistical Solutions | | | RSRV |
| 3612 | MHFX | MHF LOGISTICAL SOLUTIONS INC | | | SCAC4 |
| 3613 | MHFX | MHF Logistical Solutions Inc. | | USA | TRAFFIC |
| 3614 | MHG | Magdeburger Hafen GmbH | | DE | VKM |
| 3615 | MHGI | MARSH LP GAS CO INC | | | SCAC4 |
| 3616 | MHGN | MARQUIS HEATING INC | | | SCAC4 |
| 3617 | MHGO | MOHEGAN OIL CO INC | | | SCAC4 |
| 3618 | MHGP | MARS HILL GROUP LLC | | | SCAC4 |
| 3619 | MHGR | MH GROUP LLC | | | SCAC4 |
| 3620 | MHHC | MERRITT HEAVY HAUL LLC | | | SCAC4 |
| 3621 | MHHI | MATES HEAVY HAUL INC | | | SCAC4 |
| 3622 | MHHL | MILLS HEAVY HAULING LIMITED | | | SCAC4 |
| 3623 | MHHR | Mahanoy and Hazleton Ry., Inc. | added 7/1985; eliminated 10/1986 | | NAKINA |
| 3624 | MHHR | MAHANOY & HAZLETON RWY., INC. | | | PWRC |
| 3625 | MHHT | MACHINERY TRANSPORT INC | | | SCAC4 |
| 3626 | MHHU | MAERSK A/S | | DK | BIC |
| 3627 | MHHU | A P MOLLER | | | SCAC4 |
| 3628 | MHHV | MARKS HEAVY HAULING & EXCAV INC | | | SCAC4 |
| 3629 | MHHX | Mohawk & Hudson Chapter, National Railway Historical Society | added 10/2003; eliminated 1/2004; 7/2005 (not listed) | | NAKINA |
| 3630 | MHHX | MOHAWK & HUDSON CHAPTER, NATIONAL RAILWAY HISTORICAL SOCIETY | | | PWRC |
| 3631 | MHHX | MOHAWK & HUDSON CHAPTER NATIONAL RA | | | SCAC4 |
| 3632 | MHID | MONITECH INDUSTRIAL DISPLAY SOLUTIO | | | SCAC4 |
| 3633 | MHIF | MANCHESTER TRANSPORT | | | SCAC4 |
| 3634 | MHII | MIHARA TRANSFER INCORPORATED | | | SCAC4 |
| 3635 | MHIR | MAROCCHI TRUCKING CO INC | | | SCAC4 |
| 3636 | MHIU | MITSUBISHI HEAVY INDUSTRIES, LTD. | | J | BIC |
| 3637 | MHJ | Mjölby - Hästholmen Järnväg | 1910 - 1940 | S | svenska-lok.se |
| 3638 | MHJ | Mellersta Hallands Järnväg | 1886 - 1896 | S | svenska-lok.se |
| 3639 | MHK | Al-Naser Airlines | IATA: 6N, Callsign: Al-Naser, IATA Prefix: 503, Designator 6N recalled by IATA | IRQ | AVCODES |
| 3640 | MHK | Al-Naser Airlines | IATA: NR, Callsign: Al-Naser, IATA designator changed to NG. Designator 6N recalled by IATA | IRQ | AVCODES |
| 3641 | MHK | Al-Naser Airlines | IATA: NG, Callsign: Al-Naser, IATA designator changed from NR. Designator 6N recalled by IATA | IRQ | AVCODES |
| 3642 | MHKC | MOHAWK CARPET TRANSPORTATION OF GEO | | | SCAC4 |
| 3643 | MHKE | MATHENA TRUCK LINES LLC | | | SCAC4 |
| 3644 | MHKG | MINDHAM TRUCKING LLC | | | SCAC4 |
| 3645 | MHKI | MID SOUTH TRUCK LINES INC | | | SCAC4 |
| 3646 | MHKL | MAHANAY | | | SCAC4 |
| 3647 | MHKM | MOHAWK MOVING & STORAGE CO | | | SCAC4 |
| 3648 | MHKN | MARSHA | | | SCAC4 |
| 3649 | MHKP | MIGHTON TRUCKING | | | SCAC4 |
| 3650 | MHKQ | MICHAELS TRUCKING INC | | | SCAC4 |
| 3651 | MHKT | MOHAWK TRUCK INC | | | SCAC4 |
| 3652 | MHKU | HUNGARIAN DEFENCE FORCE - MILITARY MOVEMENT CENTRES | | H | BIC |
| 3653 | MHKY | MOSCHE | | | SCAC4 |
| 3654 | MHL | Meridian Airlines Ltd | Callsign: Hassimair, | WAN | AVCODES |
| 3655 | MHL | Meridian Airlines | | | ICAO1 |
| 3656 | MHLC | MOTION HOLDINGS, LLC | | | SCAC4 |
| 3657 | MHLD | MARNOR HOLDINGS LTD | | | SCAC4 |
| 3658 | MHLE | MITCHELL TRANSPORTATION MANAGEMENT | | | SCAC4 |
| 3659 | MHLF | MOORES HAULING LLC | | | SCAC4 |
| 3660 | MHLI | MAHAL TRANSPORT LINES LTD | | | SCAC4 |
| 3661 | MHLK | MORTGAGE HILL TRUCKING | | | SCAC4 |
| 3662 | MHLM | MHL | | | SCAC4 |
| 3663 | MHLN | MARSHALL OIL CO INC | | | SCAC4 |
| 3664 | MHLO | MACHINERIE LICO INC | | | SCAC4 |
| 3665 | MHLQ | MILE HIGH LOGISTICS INC | | | SCAC4 |
| 3666 | MHLR | MORGAN & HUNT OIL CO | | | SCAC4 |
| 3667 | MHLS | MARSHALL DIST CO INC | | | SCAC4 |
| 3668 | MHLT | MOHOLLAND TRANSFER CO INC | | | SCAC4 |
| 3669 | MHLU | MARKHOR SHIPPING LLC | | UAE | BIC |
| 3670 | MHLU | MADDOX HOLDING B V | | | SCAC4 |
| 3671 | MHLX | General American Transportation Corp. | 1/1975-1/1980; eliminated 10/1992 | | NAKINA |
| 3672 | MHLX | General American Transportation Corp., Freight Car Division | added 10/1971 | | NAKINA |
| 3673 | MHLX | Union Refrigerator Transit Lines, Division of General American Transportation Corp. | eliminated 10/1971 | | NAKINA |
| 3674 | MHLX | Union Refrigerator Transit Lines | 4/1970 | | NAKINA |
| 3675 | MHLX | Union Refrigerator Transit Lines, Division of General American Transportation Corp. | 10/1966 | | NAKINA |
| 3676 | MHLX | Union Refrigerator Transit Lines | added 1/1962; 7/1965 | | NAKINA |
| 3677 | MHLX | Union Refrigerator Transit Lines | added 1/62; 7/65 | | NRHS |
| 3678 | MHLX | Union Refrigerator Transit Lines, Division of General American Transportation Corp. | Oct-66 | | NRHS |
| 3679 | MHLX | Union Refrigerator Transit Lines | Apr-70 | | NRHS |
| 3680 | MHLX | Union Refrigerator Transit Lines, Division of General American Transportation Corp. | eliminated 10/71 | | NRHS |
| 3681 | MHLX | General American Transportation Corp., Freight Car Division | added 10/71 | | NRHS |
| 3682 | MHLX | General American Transportation Corp. | 1/75-1/80; eliminated 10/92 | | NRHS |
| 3683 | MHLX | (GATX; {UNION REFRIGERATOR TRANSIT LINES]) RETIRED 08-19-92 ATP (1360) [MILLER BREWING CO. - LESSEE] | | | PWRC |
| 3684 | MHLX | General American Transportation Corporation (GATX) | | | RSRV |
| 3685 | MHLX | MASCOUTIN HEIGHTS LEASING CO LLC | | | SCAC4 |
| 3686 | MHM | Mount Hope Mineral R.R.Co. | 1/1975 | | NAKINA |
| 3687 | MHM | Consolidated Rail Corp. | 1/1980 | | NAKINA |
| 3688 | MHM | Mount Hope Mineral R.R.Co. | Jan-75 | | NRHS |
| 3689 | MHM | Consolidated Rail Corp. | Jan-80 | | NRHS |
| 3690 | MHM | *MT. HOPE MINERAL RAILROAD CO. | | | PWRC |
| 3691 | MHM | *CONRAIL | | | PWRC |
| 3692 | MHM | Mt. Hope Mineral Railroad (Norfolk Southern) | | | RSRV |
| 3693 | MHMA | MORRIS, THOMAS A | | | SCAC4 |
| 3694 | MHMB | MIHM BROTHERS INC | | | SCAC4 |
| 3695 | MHMC | MITCHEM TRUCKING LLC | | | SCAC4 |
| 3696 | MHMD | MINES, THOMAS D | | | SCAC4 |
| 3697 | MHME | MARSHA | | | SCAC4 |
| 3698 | MHMF | MUNCKHOF MANUFACTURING | | | SCAC4 |
| 3699 | MHMH | MURRAY, HANK AND MARY | | | SCAC4 |
| 3700 | MHMI | MACCOSHA | | | SCAC4 |
