| 5501 | LNYL | LEYLA NY LLC | | | SCAC4 |
| 5502 | LNYM | LLOYDS OF NEW YORK MESSENGER SERVIC | | | SCAC3 |
| 5503 | LNYO | LANCASTER AND NEW YORK TRANSPORTATI | | | SCAC3 |
| 5504 | LNYR | LOONEY, RANDY TRUCKING | | | SCAC3 |
| 5505 | LNZ | Litag KG | Callsign: Linz, | A | AVCODES |
| 5506 | LNZB | LANTZ BROTHERS | | | SCAC3 |
| 5507 | LNZC | LENZ, CHARLES & COMPANY | | | SCAC3 |
| 5508 | LNZC | LENERTZ TRANSPORTATION INC | | | SCAC4 |
| 5509 | LNZQ | LENZ MOVING & STORAGE CO | | | SCAC3 |
| 5510 | LNZT | L & Z TRUCKING | | | SCAC3 |
| 5511 | LNZZ | CSX TRANSPORTATION, INC. | | | PWRC |
| 5512 | LO | Polskie Linie Lotnocze (LOT) | ICAO: LOT, Callsign: Pollot, IATA Prefix: 080, | PL | AVCODES |
| 5513 | LO | Métro Lausanne-Ouchy SA | | CH | VKM |
| 5514 | LOA | Sukhumi Airways | Callsign: Loreksi, | GE | AVCODES |
| 5515 | LOA | Lonestar Airways | Callsign: Loneair, | LB | AVCODES |
| 5516 | LOA | Missouri Pacific System | eliminated 1/1981 | | NAKINA |
| 5517 | LOA | Missouri Pacific Railroad Co. | added 1/1977; 1/1980 | | NAKINA |
| 5518 | LOA | Texas and Pacific Railway Co. | 1/1975; eliminated 1/1977 | | NAKINA |
| 5519 | LOA | Texas and Pacific Railway Co. | 1/75; eliminated 1/77 | | NRHS |
| 5520 | LOA | Missouri Pacific Railroad Co. | added 1/77; 1/80 | | NRHS |
| 5521 | LOA | Missouri Pacific System | eliminated 1/81 | | NRHS |
| 5522 | LOA | MISSOURI PACIFIC RAILROAD CO. [TEXAS & PACIFIC RWY. CO.] | | | PWRC |
| 5523 | LOAC | LOOMIS ARMORED CAR SERVICE LTD | | | SCAC3 |
| 5524 | LOAC | LONDON STAIRCASE INC | | | SCAC4 |
| 5525 | LOAD | LOAD MASTERS | | | SCAC3 |
| 5526 | LOAD | LOAD MASTERS | | | SCAC4 |
| 5527 | LOAE | LOADSTAR INC | | | SCAC4 |
| 5528 | LOAG | LOTT, ARLO G TRUCKING INC | | | SCAC3 |
| 5529 | LOAG | LOTT, ARLO G TRUCKING INC | | | SCAC4 |
| 5530 | LOAI | LOAD-IT | | | SCAC3 |
| 5531 | LOAJ | LOOMIS ARMORED CAR SERVICE INC | | | SCAC3 |
| 5532 | LOAM | Louisiana Midland Ry. Co. | added 7/1974; 1/1975-1/1980; eliminated 1/1987 | | NAKINA |
| 5533 | LOAM | Louisiana Midland Ry. Co. | added 7/74; 1/75-1/80; eliminated 1/87 | | NRHS |
| 5534 | LOAM | LOUISIANA MIDLAND RAILWAY CO. | | | PWRC |
| 5535 | LOAM | Louisiana Midland Railway | | | RSRV |
| 5536 | LOAM | Louisiana Midland Ry. Co. | | USA | TRAFFIC |
| 5537 | LOAN | LOERA ARCEO, JR ROLANDO NOEL | | | SCAC4 |
| 5538 | LOAO | LOCKPORT CHEMICAL COMPANY INC | | | SCAC3 |
| 5539 | LOAQ | LOURASH CONSTRUCTION INC | | | SCAC3 |
| 5540 | LOAS | LOS ANGELES SEATTLE LTL EXPRESS | | | SCAC3 |
| 5541 | LOAS | LOPEZ JAQUEZ, JULIAN | | | SCAC4 |
| 5542 | LOAT | LOA TRANSPORT | | | SCAC4 |
| 5543 | LOAX | American Refrigerator Transit Co. | added 4/1963; 7/1965-1/1975; eliminated 10/1976 | | NAKINA |
| 5544 | LOAX | American Refrigerator Transit Co. | 7/65-1/75 | | NRHS |
| 5545 | LOAX | AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 5546 | LOBC | LOGISTICS OF BAJA CALIFORNIA | | | SCAC4 |
| 5547 | LOBD | LOWBED, BRIAN CECIL | | | SCAC3 |
| 5548 | LOBI | LOMBARDO BROS CARTAGE COMPANY | | | SCAC3 |
| 5549 | LOBK | LO-BO TRUCKING INC | | | SCAC3 |
| 5550 | LOBK | LOGISTICS ONE BROKERAGE INC | | | SCAC4 |
| 5551 | LOBL | LOBLOWS LTD | | | SCAC3 |
| 5552 | LOBR | LOCKWOOD BROTHERS INC | | | SCAC3 |
| 5553 | LOBS | LOBOSCO, MICHAEL | | | SCAC3 |
| 5554 | LOBS | LOBSTERS ALIVE LIMITED | | | SCAC4 |
| 5555 | LOBT | LOUNSBURY TRUCKING | | | SCAC3 |
| 5556 | LOBW | LOBLAW | | | SCAC4 |
| 5557 | LOC | Locavia 49 | Callsign: Locavia, | F | AVCODES |
| 5558 | LOC | Locair Incorporated d/b/a Air Azul | IATA: ZQ, Callsign: Locair, Founded in 2007. Suspended operations on 18 July 2009. | USA | AVCODES |
| 5559 | LOC | Missouri Pacific System | eliminated 1/1981 | | NAKINA |
| 5560 | LOC | Missouri Pacific Railroad Co. | added 1/1977; 1/1980 | | NAKINA |
| 5561 | LOC | Texas and Pacific Railway Co. | 1/1975; eliminated 1/1977 | | NAKINA |
| 5562 | LOC | Texas and Pacific Railway Co. | 1/75; eliminated 1/77 | | NRHS |
| 5563 | LOC | Missouri Pacific Railroad Co. | added 1/77; 1/80 | | NRHS |
| 5564 | LOC | Missouri Pacific System | eliminated 1/81 | | NRHS |
| 5565 | LOC | MISSOURI PACIFIC RAILROAD CO. [TEXAS & PACIFIC RWY. CO.] | | | PWRC |
| 5566 | LOC | Locomore | City: Locomore GmbH & Co. KG | D | TRAFFIC |
| 5567 | LOCA | LITTLE TRANSPORTATION SERVICE LLC | | | SCAC4 |
| 5568 | LOCB | LOR-CO BULK TRANSPORT INC | | | SCAC3 |
| 5569 | LOCC | LOCAL OIL CO OF ANOKA INC | | | SCAC4 |
| 5570 | LOCD | LOCAL DELIVERY SERVICE CO INC | | | SCAC3 |
| 5571 | LOCE | LOCO TRANSPORT ENTERPRISES INC | | | SCAC4 |
| 5572 | LOCF | LOCATION 2000 TRANSPORTATION INC | | | SCAC4 |
| 5573 | LOCG | LOUISVILLE CARTAGE COMPANY INC | | | SCAC3 |
| 5574 | LOCH | LOCHNESS SHIPPING INC | | | SCAC3 |
| 5575 | LOCH | LOCHNESS SHIPPING INC | | | SCAC4 |
| 5576 | LOCI | LOCUST INDUSTRIES INC | | | SCAC3 |
| 5577 | LOCI | LOCUST INDUSTRIES LIMITED | | | SCAC4 |
| 5578 | LOCK | LOMANS CUSTOM KITCHENS INC | | | SCAC4 |
| 5579 | LOCL | LEES ON-CALL DELIVERY SERVICE | | | SCAC3 |
| 5580 | LOCM | LEVEL ONE CARRIERS INC | | | SCAC4 |
| 5581 | LOCN | LOCATION CIRCUIT INC | | | SCAC3 |
| 5582 | LOCO | LOCO INC | | | SCAC4 |
| 5583 | LOCON | Logistik & Consulting AG | Berlin | D | privat-bahn.de |
| 5584 | LOCON | Locon Logistic & Consulting AG | | D | TRAFFIC |
| 5585 | LOCON | LOCON Logistik & Consulting | | DE | VKM |
| 5586 | LOCP | LIBERTY OIL COMPANY INC | | | SCAC4 |
| 5587 | LOCQ | LOCAL CARRIERS INC | | | SCAC3 |
| 5588 | LOCQ | LOPEZ OCHOA, VERONICA MARCELLE | | | SCAC4 |
| 5589 | LOCR | LOCKER MOVING & STORAGE, INC | | | SCAC3 |
| 5590 | LOCS | LOUISIANA COACHES INC | | | SCAC4 |
| 5591 | LOCT | LOWER COLUMBIA TRUCKING INC | | | SCAC3 |
| 5592 | LOCU | LOCALLTAINER LOCACOES DE CONTAINERS COM.E.SERV.LTDA | | BR | BIC |
| 5593 | LOCV | LOCHINVAR CORPORATION | | | SCAC4 |
| 5594 | LOCW | LINDSAY OIL CO | | | SCAC4 |
| 5595 | LOCX | L.A. Colo LLC | added 1/2010 | | NAKINA |
| 5596 | LOCX | L.A. Colo & Sons Inc. | eliminated 1/2010 | | NAKINA |
| 5597 | LOCX | Mobile Locomotive Services, Inc. | 7/2005 (not listed) | | NAKINA |
| 5598 | LOCX | American Refrigerator Transit Co. | added 1/1965; 7/1965-1/1975; eliminated 10/1976 | | NAKINA |
| 5599 | LOCX | American Refrigerator Transit Co. | added 1/65; 7/65-1/75 | | NRHS |
| 5600 | LOCX | *AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
