| 4501 | NOR | *CLEVELAND, CINCINNATI, CHICAGO & ST. LOUIS RWY. [CINCINNATI NORTHERN RAILROAD CO.] | | | PWRC |
| 4502 | NOR | *NORTHWESTERN OKLAHOMA RAILROAD CO. | | | PWRC |
| 4503 | NOR | NOR SHEENA LINES | | | SCAC4 |
| 4504 | NOR | Norte | | E | TRAFFIC |
| 4505 | NORA | Northrail GmbH | | D | TRAFFIC |
| 4506 | NORB | NORMAN BROTHERS INC | | | SCAC3 |
| 4507 | NORB | Nordbahn Eisenbahngesellschaft | Real: NBE | D | TRAFFIC |
| 4508 | NORBV | North Boulevard IBOA | | USA | TRAFFIC |
| 4509 | NORC | NORRIS CO | | | SCAC3 |
| 4510 | NORC | NordCargo | | I | TRAFFIC |
| 4511 | NORCM | NORCEM AS | | NO | VKM |
| 4512 | NORD | NORDIC DISTRIBUTING CO | | | SCAC3 |
| 4513 | NORD | NORDAN EXPRESS INC | | | SCAC4 |
| 4514 | NORD | | | F | TRAFFIC |
| 4515 | NORDI | NORDIGAS, a.s. | | CZ | VKM |
| 4516 | NORE | NORTHEAST TOWING INC | | | SCAC3 |
| 4517 | NORF | NORFOLK TERMINAL CORP | | | SCAC3 |
| 4518 | NORH | NORSAR | | | SCAC4 |
| 4519 | NORI | NORSTAR INDUSTRIES LTD | | | SCAC4 |
| 4520 | NORJ | NORTH JERSEY TANK LINES INC | | | SCAC3 |
| 4521 | NORJ | NORDICOM INC | | | SCAC4 |
| 4522 | NORK | | City: Norrköping, Veolia is the operator for the tram lines in Norrköping, but the infrastructure and the vehicles are owned by the community. | S | TRAFFIC |
| 4523 | NORL | NORTHLAND CORPORATION | | | SCAC3 |
| 4524 | NORL | NORTEX LOGISTICS | | | SCAC4 |
| 4525 | NORM | Normetal | 1/1975-1/1980 | | NAKINA |
| 4526 | NORM | Normetal | 1/75-1/80 | | NRHS |
| 4527 | NORM | *NORMETAL | | | PWRC |
| 4528 | NORM | *NORTHERN OHIO RAILWAY MUSEUM | | | PWRC |
| 4529 | NORM | Normetal | | | RSRV |
| 4530 | NORN | NORTHWEST TRANSPORT INC | | | SCAC3 |
| 4531 | NORO | NORTH ROAD MOTORS & BODY SHOP | | | SCAC3 |
| 4532 | NORO | NORTHERN LOGISTICS INC | | | SCAC4 |
| 4533 | NORP | NORTHERN LUMBER TRANSPORT | | | SCAC3 |
| 4534 | NORQ | NORUP TRANSPORTATION INC | | | SCAC3 |
| 4535 | NORQ | NORTH STAR | | | SCAC4 |
| 4536 | NORR | NORRIS, EARL W | | | SCAC3 |
| 4537 | NORR | NORGISTICS NORTH AMERICA INC | | | SCAC4 |
| 4538 | NORR | Northern Rail Ltd | Northern Rail is a train operating company that has operated local services in the north of England since 2004. The franchise was won by a consortium formed of NedRailways (the English unit of Nederlandse Spoorwegen, the state-owned train operating company of the Netherlands) and Serco, an international operator of public transport systems. This consortium had already won the contract to operate the Merseyrail network earlier in 2003. | GB | TRAFFIC |
| 4539 | NORS | NORTHSTAR TRANSPORTATION INC | | | SCAC4 |
| 4540 | NORT | NORTHERN TRANSPORT LIMITED | | | SCAC3 |
| 4541 | NORT | NORMAND, ALAIN TRANSPORT INC | | | SCAC4 |
| 4542 | NORTA | New Orleans Regional Transit Authority | | USA | TRAFFIC |
| 4543 | NORTH | Northland Logistics AB | | SE | VKM |
| 4544 | NORTRAN | North Suburban Mass Transit District | City: Chicago | USA | TRAFFIC |
| 4545 | NORU | NORDBØ HOLDING AS | | N | BIC |
| 4546 | NORU | NORASIA LINE | | | SCAC3 |
| 4547 | NORU | NORCO, LTD | | | SCAC4 |
| 4548 | NORV | NORTHERN ROUTES TRANSPORTATION | | | SCAC3 |
| 4549 | NORV | NORTHERN ROUTES TRANSPORTATION | | | SCAC4 |
| 4550 | NORW | NORWOOD TRANSPORTATION INC | | | SCAC3 |
| 4551 | NORW | NORWOOD TRANSPORTATION INC | | | SCAC4 |
| 4552 | NORWALK | Norwalk Transit District | | USA | TRAFFIC |
| 4553 | NORX | Northern Indiana Public Service Co. | added 1/1965; 7/1965-7/2005 | | NAKINA |
| 4554 | NORX | Normandy Tank Car Co. | 4/1947 | | NAKINA |
| 4555 | NORX | Northern Indiana Public Service Co. | added 1/65; 7/65-7/2000 | | NRHS |
| 4556 | NORX | *NORMANDY TANK CAR CO. | | | PWRC |
| 4557 | NORX | +NORTHERN INDIANA PUBLIC SERVICE CO. | | | PWRC |
| 4558 | NORX | Northern Indiana Public Service | | | RSRV |
| 4559 | NORX | NORTHERN INDIANA PUBLIC SERVICE CO | | | SCAC3 |
| 4560 | NORY | NORTHWOODS TRANSFER | | | SCAC4 |
| 4561 | NOS | Norway Airlines Charter | Callsign: Norspeed, Ceased operations | N | AVCODES |
| 4562 | NOS | Norways Airlines | IATA: JA, | N | AVCODES |
| 4563 | NOS | Neos S.p.A. | IATA: NO, Callsign: Moonflower, IATA Prefix: 703, | I | AVCODES |
| 4564 | NOS | Neos | IATA: NO | | ICAO1 |
| 4565 | NOSA | NOSAC | | | SCAC3 |
| 4566 | NOSA | NORWEGIAN SPECIALIZED AUTOCARRIERS | | | SCAC4 |
| 4567 | NOSBB | Niederösterreichische Schneebergbahn GmbH | | AT | VKM |
| 4568 | NOSC | NOSS BROTHERS TRUCKING INC | | | SCAC3 |
| 4569 | NOSC | NOSS BROTHERS TRUCKING INC | | | SCAC4 |
| 4570 | NOSE | Nosé Electric Railway | Fully owned by the Hankyu Railway | J | TRAFFIC |
| 4571 | NOSF | NORTH STAR FREIGHT INC | | | SCAC3 |
| 4572 | NOSH | NORTH SHORE&CENTRAL ILLINOIS FREIGHT CO | | | SCAC3 |
| 4573 | NOSH | NORTH SHORE & CENTRAL ILLINOIS FRT | | | SCAC4 |
| 4574 | NOSI | NORTHSIDE TRANSPORTATION CO | | | SCAC3 |
| 4575 | NOSJ | NORRIS, JAMES TRUCKING CO | | | SCAC3 |
| 4576 | NOSL | NORTH SHORE LOGISTICS CO | | | SCAC4 |
| 4577 | NOSM | NORTH SUBURBAN MESSENGER SERVICE IN | | | SCAC3 |
| 4578 | NOSN | NORTH SUBURBAN MESSENGER SERVICE | | | SCAC3 |
| 4579 | NOSN | NINE ONE THREE ONE-SIX THREE TWO TH | | | SCAC4 |
| 4580 | NOSO | NORTH SHORE RECYCLED FIBERS CORP | | | SCAC3 |
| 4581 | NOSP | NORFOLK NAVAL SHIPYARD | | | PWRC |
| 4582 | NOSP | NORTH STAR TRANSPORT | | | SCAC3 |
| 4583 | NOSQ | NORTH STAR TRANSFER | | | SCAC3 |
| 4584 | NOSR | NINE ONE SEVEN ZERO-ONE NINE ZERO F | | | SCAC4 |
| 4585 | NOSS | NORTH STATE STORAGE CO INC | | | SCAC3 |
| 4586 | NOST | NORTHSIDE TRUCKING CO | | | SCAC3 |
| 4587 | NOST | NORTHERN STATES TRANSPORTATION INC | | | SCAC4 |
| 4588 | NOSTA | NOSTA Niederösterreichische Außenhandelsgesellschaft mbH | | AT | VKM |
| 4589 | NOSU | CMA-CGM | | F | BIC |
| 4590 | NOSU | NEPTUNE ORIENT LINES, LTD. | | | PWRC |
| 4591 | NOSU | Neptune Orient Lines | | | RSRV |
| 4592 | NOSU | NEPTUNE ORIENT LINES LTD | | | SCAC3 |
| 4593 | NOSU | APL CO PTE LTD-NOL GROUP | | | SCAC4 |
| 4594 | NOSV | NORTHSTAR SERVICES LTD | | | SCAC3 |
| 4595 | NOSV | NORTHSTAR SERVICES LTD | | | SCAC4 |
| 4596 | NOSW | NORTH STAR SHIPPING | | | SCAC3 |
| 4597 | NOSW | NORTH STAR SHIPPING | | | SCAC4 |
| 4598 | NOSX | NORTHERN SUN | | | PWRC |
| 4599 | NOT | Linea Aerea Costa Norte, S.A. | Callsign: Costa Norte, | RCH | AVCODES |
| 4600 | NOT | NorOntair | IATA: NR, Callsign: Norontair, | CDN | AVCODES |
