| 2401 | MEBF | MORALES EXPRESS INC | | | SCAC4 |
| 2402 | MEBG | MAINE METAL RECYCLING INC | | | SCAC4 |
| 2403 | MEBH | MINER ENTERPRISES LLC | | | SCAC4 |
| 2404 | MEBI | MCCARDLES EXPRESS INC | | | SCAC4 |
| 2405 | MEBJ | MOUNTAINEER EXPEDITE LLC | | | SCAC4 |
| 2406 | MEBK | MEGA EXPRESS INC | | | SCAC4 |
| 2407 | MEBM | ME & BROTHERS | | | SCAC4 |
| 2408 | MEBMD | MEB-BAHNDIENSTLEISTUNGEN Gmbh | | DE | VKM |
| 2409 | MEBQ | MEI TRUCKING LLC | | | SCAC4 |
| 2410 | MEBR | MEIBORG BROS INC | | | SCAC4 |
| 2411 | MEBT | MELTON, BILL TRUCKING INC | | | SCAC4 |
| 2412 | MEBU | MEEBERG CONTAINER SERVICE BV | | NL | BIC |
| 2413 | MEBU | MEEBERG CONTAINER SERVICE BV | | | SCAC4 |
| 2414 | MEBV | MONVAS ENTERPRISE LTD | | | SCAC4 |
| 2415 | MEBW | MIDWAY EXPRESS LTD | | | SCAC4 |
| 2416 | MEBY | MARITIME ENERGY | | | SCAC4 |
| 2417 | MEC | Mercury Air Cargo, Inc. | IATA: BX, Callsign: Mercair, IATA designator changed to 4X | USA | AVCODES |
| 2418 | MEC | Mercury Air Cargo, Inc. d/b/a Air Mercury | IATA: 4X, Callsign: Mercair, IATA Prefix: 805, IATA designator changed from BX* | USA | AVCODES |
| 2419 | MEC | Mercury Aircourier Service | | | ICAO1 |
| 2420 | MEC | Maine Central R.R. Co. | 7/1930-1/1994; eliminated 4/1997; added 7/1998; 7/2000-7/2005; eliminated 10/2006; added 4/2009 | | NAKINA |
| 2421 | MEC | Maine Central R.R. Co. | 4/38-1/94; eliminated 4/97; added 7/98; 7/2000 | | NRHS |
| 2422 | MEC | *ST RAIL SYSTEM | | | PWRC |
| 2423 | MEC | +GUILFORD RAIL SYSTEM [MAINE CENTRAL RAILROAD] | | | PWRC |
| 2424 | MEC | Maine Central Railroad (Pan Am Railways) | | | RSRV |
| 2425 | MEC | Maine Central Railroad | | USA | TRAFFIC |
| 2426 | MECA | MECCA & SON TRUCKING CORPORATION | | | SCAC1 |
| 2427 | MECA | MECCA & SON TRUCKING CORP | | | SCAC4 |
| 2428 | MECB | MAPLE CREEK BELGIANS | | | SCAC4 |
| 2429 | MECC | Angelo Meccoli | | F | TRAFFIC |
| 2430 | MECD | MISCO OF TERRE HAUTE INC | | | SCAC4 |
| 2431 | MECDV | MECANO SERV SRL | | RO | VKM |
| 2432 | MECG | MTT OF LACROSSE INC | | | SCAC4 |
| 2433 | MECHA | MONTAJES ELÉCTRICOS CHAMORRO, S.A. | | ES | VKM |
| 2434 | MECI | MARINE EXPLORATION CO INC | | | PWRC |
| 2435 | MECJ | MIRANCY EXPRESS INC | | | SCAC4 |
| 2436 | MECL | Museums Eisenbahn Club Losheim e.V. | Losheim | D | privat-bahn.de |
| 2437 | MECL | MERCANA ART DECOR | | | SCAC4 |
| 2438 | MECP | M E C EXPRESS LIMITED | | | SCAC4 |
| 2439 | MECQ | MADSEN, SUSAN M | | | SCAC4 |
| 2440 | MECS | Mecseki kisvasút - Pécs | | H | TRAFFIC |
| 2441 | MECT | MORTENSON CONSTRUCTION | | | SCAC4 |
| 2442 | MECU | MELFI MARINE CORP MAIN OFFICE | | | SCAC4 |
| 2443 | MECX | Trinity Rail Management, Inc. | added 7/1997; 7/2000-7/2005; eliminated 1/2007 | | NAKINA |
| 2444 | MECX | Transcisco Leasing Co. | added 7/1994; eliminated 7/1997 | | NAKINA |
| 2445 | MECX | Miner-Edgar Chemical Corp. | 7/1930-7/1932 | | NAKINA |
| 2446 | MECX | Miner-Edgar Co. | 8/1920-7/1923 | | NAKINA |
| 2447 | MECX | Transcisco Leasing Co. | added 7/94; eliminated 7/97 | | NRHS |
| 2448 | MECX | Trinity Rail Management, Inc. | added 7/97; 7/2000 | | NRHS |
| 2449 | MECX | *MINER-EDGAR CHEMICAL CORP. | | | PWRC |
| 2450 | MECX | *TRINITY RAIL MANAGEMENT INCORPORATED [TRANSCISCO LEASING COMPANY } | | | PWRC |
| 2451 | MECX | Trinity Rail Management (Murray Energy Corp) | | | RSRV |
| 2452 | MECY | MERCURY TRANSPORTATION INC | | | SCAC4 |
| 2453 | MECZ | MILESTONE EQUIPMENT CORPORATION | | | SCAC4 |
| 2454 | MED | Ontario Ministry Of Health | Callsign: Medical, | CDN | AVCODES |
| 2455 | MED | Med Airways | IATA: 7Y, Founded in 2000 as Flying Carpet. IATA Designator 7Y* recalled | RL | AVCODES |
| 2456 | MED | Med Airways | Founded in 2000 as Flying Carpet. IATA Designator 7Y* recalled | RL | AVCODES |
| 2457 | MED | Ontario Ministry of Health | | | ICAO1 |
| 2458 | MED | MEADOWLAND | | | SCAC4 |
| 2459 | MEDA | MEDITERRANEAN AGENCIES | | | PWRC |
| 2460 | MEDA | MEDTRANS LLC | | | SCAC4 |
| 2461 | MEDD | MED STAR SRL | | | SCAC4 |
| 2462 | MEDE | MEDFORD FUEL | | | SCAC4 |
| 2463 | MEDF | MAN, E D & F SUGAR INC | | | SCAC4 |
| 2464 | MEDG | MEDINA GONZALEZ, JUAN | | | SCAC4 |
| 2465 | MEDI | SC Meditur SA | | RO | TRAFFIC |
| 2466 | MEDJ | MEDINA GARCIA, JOSE OSCAR | | | SCAC4 |
| 2467 | MEDM | MEDINA TRANSPORTATION SERVICES INC | | | SCAC4 |
| 2468 | MEDP | MEDCARE SHIPPING S A | | | SCAC4 |
| 2469 | MEDT | MEDINA TRANSPORT INC | | | SCAC4 |
| 2470 | MEDU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 2471 | MEDU | BCSL US-MED LINE LTD. | | | SCAC3 |
| 2472 | MEDU | MSC MEDITTERRANEAN SHIPPING COMPANY | | | SCAC4 |
| 2473 | MEDW | MEDWAY - Operador Ferroviario e Logistico de Mercadorias, SA | Real: MED | P | TRAFFIC |
| 2474 | MEE | Elimediterranea S.r.l. | Callsign: Elimediterranea, | I | AVCODES |
| 2475 | MEE | Mediterranean Express | Callsign: Mediterranean, | GB | AVCODES |
| 2476 | MEE | Elimediterranea | | | ICAO1 |
| 2477 | MEE | Mühlhausen-Ebelebener Eisenbahn | near Erfurt/Thuringia | D | TRAFFIC |
| 2478 | MEEB | MORE INC | | | SCAC4 |
| 2479 | MEEC | MUSTANG COMMODITIES LTD | | | SCAC4 |
| 2480 | MEEH | MICHIGAN EGG EXCHANGE LLC | | | SCAC4 |
| 2481 | MEEK | MEEKS | | | SCAC4 |
| 2482 | MEEL | MET LLC | | | SCAC4 |
| 2483 | MEEM | MET INTERNATIONAL INC | | | SCAC4 |
| 2484 | MEEN | MEENAN OIL CO L P | | | SCAC4 |
| 2485 | MEEO | MCE LEASING COMPANY | | | SCAC4 |
| 2486 | MEEQ | MERRITT & SON EQUIPMENT INC | | | SCAC4 |
| 2487 | MEER | MET TRANSFER | | | SCAC4 |
| 2488 | MEES | METRO EXPRESS | | | SCAC4 |
| 2489 | MEET | MEESE TRUCKING | | | SCAC4 |
| 2490 | MEEU | MEPAVEX LOGISTICS BV | | NL | BIC |
| 2491 | MEEU | MED REEFER SRL | | | SCAC4 |
| 2492 | MEEV | MCEVOY OIL CO | | | SCAC4 |
| 2493 | MEF | Air Meridian Limited | Callsign: Empennage, | WAN | AVCODES |
| 2494 | MEF | Air Meridan | | | ICAO1 |
| 2495 | MEFE | MAIN FREIGHT INC | | | SCAC4 |
| 2496 | MEFG | MAIN EVENT FUN GAMES INC, THE | | | SCAC4 |
| 2497 | MEFI | METRO FREIGHT INC | | | SCAC4 |
| 2498 | MEFK | MARTINEZ ESCOBAR, FRANK | | | SCAC4 |
| 2499 | MEFM | MAC RAE FARMS | | | SCAC4 |
| 2500 | MEFP | MEF TRANSPORTATION LLC | | | SCAC4 |
