| 3301 | NJLK | NEW JERSEY LINK INC | | | SCAC3 |
| 3302 | NJLL | NEW JERSEY LOGISTICS LLC | | | SCAC4 |
| 3303 | NJLN | N & J LOGISTICS INC | | | SCAC4 |
| 3304 | NJLT | NJ LOGISTICS CORP | | | SCAC4 |
| 3305 | NJM | Northern Jet Management, Inc. | Callsign: Northern Jet, | USA | AVCODES |
| 3306 | NJM | Nynäshamns Järnvägsmuseum | | SE | VKM |
| 3307 | NJMA | NEW JERSEY MOTOR FREIGHT | | | SCAC4 |
| 3308 | NJMO | N J MOTOR TRANSIT CORP | | | SCAC3 |
| 3309 | NJMT | NEALY, JAMES M TRUCKING CO | | | SCAC3 |
| 3310 | NJMX | NEW JERSEY MARINE TERMINALS | | | PWRC |
| 3311 | NJNT | N J N TRANSPORT INC | | | SCAC4 |
| 3312 | NJOL | NORTH JERSEY OIL | | | SCAC4 |
| 3313 | NJOR | NAVAJO REFINING COMPANY | | | SCAC3 |
| 3314 | NJPQ | NAVAS, JOHN PRODUCE COMPANY | | | SCAC3 |
| 3315 | NJPT | NOONAN, J P TRANSPORTATION INC | | | SCAC3 |
| 3316 | NJPT | NOONAN, J P TRANSPORTATION INC | | | SCAC4 |
| 3317 | NJR | Norjet, S.A. de C.V. | Callsign: Norjet, | MEX | AVCODES |
| 3318 | NJRC | New Jersey Rail Carrier LLC | 7/2005 | | NAKINA |
| 3319 | NJRC | NEW JERSEY RAIL CARRIER LLC | | | PWRC |
| 3320 | NJRC | New Jersey Rail Carrier | | | RSRV |
| 3321 | NJRC | NEW JERSEY RAIL CARRIER LLC | | | SCAC4 |
| 3322 | NJRH | NICHOLAS, J R HAULING | | | SCAC4 |
| 3323 | NJRM | NASH, J R MOVING & STORGE COMPANY | | | SCAC3 |
| 3324 | NJRM | NASH, J R MOVING & STORAGE | | | SCAC4 |
| 3325 | NJRX | NEW JERSEY RAIL CARRIER LLC | | | PWRC |
| 3326 | NJRX | NEW JERSEY RAIL CARRIER LLC | | | SCAC4 |
| 3327 | NJRX | North Jersey Rail Leasing | | USA | TRAFFIC |
| 3328 | NJS | National Jet Systems Pty. Ltd. | IATA: NC, Callsign: National Jet, Name changed to National Jet Systems Pty. Ltd. t/a Cobham Aviation Services Australia - Airline Services w.e.f. 13 May 2009. Designator NC reinstated by IATA | AUS | AVCODES |
| 3329 | NJS | Cobham Aviation Services Australia | IATA: NC, Name changed from National Jet Systems Pty. Ltd. t/a Cobham Aviation Services Australia - Airline Services w.e.f. 13 May 2009. Designator NC recalled by IATA | AUS | AVCODES |
| 3330 | NJS | Cobham Aviation Services Australia | Name changed from National Jet Systems Pty. Ltd. Designator NC recalled by IATA | AUS | AVCODES |
| 3331 | NJS | National Jet Systems | IATA: NC | | ICAO1 |
| 3332 | NJSP | New Jersey State Police | | USA | TRAFFIC |
| 3333 | NJSR | N J S TRANSPORT CO INC | | | SCAC3 |
| 3334 | NJST | N J SPECIAL TRANSPORTATION SERVICES | | | SCAC3 |
| 3335 | NJST | N J S TRUCKING | | | SCAC4 |
| 3336 | NJST | North Jersey Surface Transit | | USA | TRAFFIC |
| 3337 | NJT | Executive Jet International, Inc. | Callsign: Netjet, Name changed to Netjets International, Inc. | USA | AVCODES |
| 3338 | NJT | Novajet | Callsign: Novajet, | F | AVCODES |
| 3339 | NJT | Netjets International, Inc. | Callsign: Netjet, Name changed from Executive Jet International, Inc. | USA | AVCODES |
| 3340 | NJT | *NEW JERSEY TANK TRUCK CARRIERS, INC. | | | PWRC |
| 3341 | NJT | *NEW JERSEY TRANSIT (NEW JERSEY DEPT. OF TRANSPORTATION) | | | PWRC |
| 3342 | NJT | Newton Junction Terminal | | | RSRV |
| 3343 | NJT | New Jersey Transit | | USA | TRAFFIC |
| 3344 | NJTA | NAUGLE, J TRUCKING | | | SCAC4 |
| 3345 | NJTA | North Jersey Transit Authority | | US-NJ | TRAFFIC |
| 3346 | NJTB | N J TRANSIT BUS OPERATIONS INC | | | SCAC3 |
| 3347 | NJTB | NORRIS, J TRUCKING INC | | | SCAC4 |
| 3348 | NJTC | N J TRANSIT OPERATIONS (COMMUTER CA | | | SCAC3 |
| 3349 | NJTC | N J TRANSIT OPERATIONS (COMMUTER CA | | | SCAC4 |
| 3350 | NJTG | NOT JUST TRUCKING LLC | | | SCAC4 |
| 3351 | NJTI | N J TRUCKING INC | | | SCAC3 |
| 3352 | NJTK | NEW JERSEY TRUCKING CORP | | | SCAC3 |
| 3353 | NJTK | NEWSOM, JIM TRUCKING INC | | | SCAC4 |
| 3354 | NJTL | NIJJAR TRUCKING LTD | | | SCAC4 |
| 3355 | NJTN | NICHOLS, JAYME TRUCKING LLC | | | SCAC4 |
| 3356 | NJTOUR | NJ Tours | NJ Tours provided charter and tour service until it was ruled that state agencies can not compete with the private sector for this business. | US-NJ | TRAFFIC |
| 3357 | NJTQ | N & J TRANSPORT INC | | | SCAC4 |
| 3358 | NJTR | NJ Transit Rail Operations | 1/1994-7/2005 | | NAKINA |
| 3359 | NJTR | NJ Transit Rail Operations | 1/94-7/2000 | | NRHS |
| 3360 | NJTR | NEW JERSEY TRANSIT RAIL OPERATIONS (NEW JERSEY DEPT. OF TRANSP.) | | | PWRC |
| 3361 | NJTR | New Jersey Transit | | | RSRV |
| 3362 | NJTR | N & J TUBING & REELING CO INC | | | SCAC4 |
| 3363 | NJTS | NEW JOURNEY TRANSPORT SERVICE INC | | | SCAC3 |
| 3364 | NJTU | NOLTY J. THERIOT, INC | | | SCAC3 |
| 3365 | NJU | Netjets Air Transport UK Limited | Callsign: Signature, Callsign changed to Artisan. Name changed from EJME (UK) Limited w.e.f. 18 February 2020. | GB | AVCODES |
| 3366 | NJU | Netjets Air Transport UK Limited | Callsign: Artisan, Callsign changed from Signature. Name changed from EJME (UK) Limited w.e.f. 18 February 2020. | GB | AVCODES |
| 3367 | NJVC | N J V CORPORATION | | | SCAC3 |
| 3368 | NJXC | NAJINDER TRANSPORT INC | | | SCAC4 |
| 3369 | NJXI | NORTH JERSEY EXPRESS INC | | | SCAC3 |
| 3370 | NJXP | NEOSHO JOPLIN EXPRESS | | | SCAC3 |
| 3371 | NJYQ | NEW JOURNEY TRANSPORT INC | | | SCAC4 |
| 3372 | NJYT | NAJY TRANSPORTATION INC | | | SCAC4 |
| 3373 | NJZ | Corporate Air Travel, LLC | Callsign: Neojet, | USA | AVCODES |
| 3374 | NJZ | NEW JERSEY ZINC CO. | | | PWRC |
| 3375 | NJZX | New Jersey Zinc Co. | 10/1957-4/1970; eliminated 4/1971 | | NAKINA |
| 3376 | NJZX | New Jersey Zinc Co. of Pennsylvania | 7/1937-7/1954 | | NAKINA |
| 3377 | NJZX | New Jersey Zinc Co. (of Pa.) | 8/1920-7/1935 | | NAKINA |
| 3378 | NJZX | New Jersey Zinc Co. | 4/38-4/70; eliminated 4/71 | | NRHS |
| 3379 | NJZX | NEW JERSEY ZINC CO. | | | PWRC |
| 3380 | NJZX | NEW JERSEY ZINC CO | | | SCAC3 |
| 3381 | NK | Spirit Airlines, Inc. | ICAO: NKS, Callsign: Spirit Wings, IATA Prefix: 487, | USA | AVCODES |
| 3382 | NK | Norcanair | IATA designator changed from SQ | CDN | AVCODES |
| 3383 | NK | Air Vanuatu | ICAO: AVN, Callsign: Air Van, | VAN | AVCODES |
| 3384 | NK | Niigata Kotsu Ltd. | | J | TRAFFIC |
| 3385 | NK | Nordkalk AB | | SE | VKM |
| 3386 | NKA | Northern Dene Airways Ltd. | IATA: U7, Callsign: Norcanair, Designator U7* recalled by IATA. Name changed from Norcanair | CDN | AVCODES |
| 3387 | NKA | Anka Aviation Cargo | Callsign: Anka Cargo, | ET | AVCODES |
| 3388 | NKAKR | Nadgoplańska Bus Transport in Kruszwica | City: Kruszwica | PL | TRAFFIC |
| 3389 | NKAL | N | | | SCAC4 |
| 3390 | NKAM | NK AMERICA INC | | | SCAC4 |
| 3391 | NKAN | Nishitetsu Kanko Bus | | J | TRAFFIC |
| 3392 | NKAR | NOR-AM GO KARTS INC | | | SCAC4 |
| 3393 | NKAT | NKA TRANSPORTATION INC | | | SCAC4 |
| 3394 | NKCK | NICKELS CARTAGE CO LTD | | | SCAC4 |
| 3395 | NKCL | NIPPO KISEN CO LTD | | | SCAC3 |
| 3396 | NKCM | NAKAMOTO, C MOVERS | | | SCAC3 |
| 3397 | NKCM | NOBEK B V | | | SCAC4 |
| 3398 | NKCN | N K C TRANSPORTATION LLC | | | SCAC4 |
| 3399 | NKCO | NIELSEN, KNUD CO INC | | | SCAC3 |
| 3400 | NKCR | Nebraska, Kansas & Colorado RailNet, Inc. | added 1/1999; 7/2000-7/2005 | | NAKINA |
