| 4101 | NNLL | NAMRON LOGISTICS LLC | | | SCAC4 |
| 4102 | NNLU | NIGERIAN NATIONAL SHIPPING LINE | | | SCAC3 |
| 4103 | NNME | NELSON, MIKE | | | SCAC4 |
| 4104 | NNMH | NORRIS & NORRIS MOBILE HOME | | | SCAC3 |
| 4105 | NNMT | N & M TRUCKING INC | | | SCAC3 |
| 4106 | NNOE | NINE ONE THREE EIGHT-EIGHT SIX ONE | | | SCAC4 |
| 4107 | NNOG | NORTH NATIONAL OUTDOOR GROUP INC | | | SCAC4 |
| 4108 | NNPR | NEW YORK & NEW JERSEY PORT RAILROAD CO. | | | PWRC |
| 4109 | NNPU | NIGERIAN NATIONAL PETROLEUM CORPORATION | | | PWRC |
| 4110 | NNPU | Nigerian National Petroleum Corporation | | | RSRV |
| 4111 | NNPU | NIGERIAN NATIONAL PETROLEUM CORP. | | | SCAC3 |
| 4112 | NNPW | NIC NAK PATTI WACK | | | SCAC4 |
| 4113 | NNQB | NINE ONE FIVE FOUR-EIGHT SIX | | | SCAC4 |
| 4114 | NNQC | NINE ONE THREE NINE-FOUR ZERO TWO T | | | SCAC4 |
| 4115 | NNRA | NNR AIRCARGO SERVICE (USA INC) | | | SCAC4 |
| 4116 | NNRC | NNR GLOBAL LOGISTICS USA INC | | | SCAC4 |
| 4117 | NNRX | Nye & Nissen Refrigerator Line Co. (North American Car Corp.) | 7/1935 | | NAKINA |
| 4118 | NNRX | NEVADA NORTHERN RAILWAY | | | PWRC |
| 4119 | NNSB | NINE ZERO ONE SIX-ONE ONE SIX | | | SCAC4 |
| 4120 | NNSL | NORTHERN SERVICE LLC | | | SCAC4 |
| 4121 | NNSN | NORTHERN LEASING INC | | | SCAC3 |
| 4122 | NNSN | NORTHERN LEASING INC | | | SCAC4 |
| 4123 | NNST | N & S TRUCKING INC | | | SCAC3 |
| 4124 | NNSX | Newport News Shipbuilding and Dry Dock Co. | 7/1965-1/1994; eliminated 7/1996; added 10/1996; eliminated 1/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 4125 | NNSX | Newport News Shipbuilding and Dry Dock Co. | 7/65-1/94; eliminated 7/96; added 10/96; eliminated 1/97; 7/2000 | | NRHS |
| 4126 | NNSX | NEWPORT NEWS SHIPBUILDING & DRY DOCK CO. | | | PWRC |
| 4127 | NNSX | Newport News Shipbuilding and Dry Dock | | | RSRV |
| 4128 | NNSX | NEWPORT NEWS SHIPBUILDING & DRY DOC | | | SCAC4 |
| 4129 | NNTC | NINE ZERO ZERO NINE-THREE NINE FOUR | | | SCAC4 |
| 4130 | NNTD | NANETTE DISTRIBUTOR INC | | | SCAC4 |
| 4131 | NNTF | NINE ZERO SIX EIGHT NINE TWO FOUR O | | | SCAC4 |
| 4132 | NNTI | NATIONAL TRANSPORT INC | | | SCAC3 |
| 4133 | NNTI | N & N TRANSPORT INC | | | SCAC4 |
| 4134 | NNTK | N & N TRUCKING INC | | | SCAC3 |
| 4135 | NNTP | NINETY NINE (99) TRANSPORT INC | | | SCAC4 |
| 4136 | NNTR | N & N TRUCKING | | | SCAC4 |
| 4137 | NNVC | NATIONAL NAVIGATION CO CAIRO EGYPT | | | SCAC4 |
| 4138 | NNVG | Norddeutsche Nahverkehrsgesellschaft mbH | Schenefeld | D | privat-bahn.de |
| 4139 | NNVG | NIAGARA NAVIGATION CO | | | SCAC3 |
| 4140 | NNW | Nebraska Northwestern Railroad | | | RSRV |
| 4141 | NNW | NEBRASKA NORTHWESTERN RAILROAD INC. | | | SCAC4 |
| 4142 | NNWT | N & W TRANSFER | | | SCAC3 |
| 4143 | NNWT | N N W TRUCKING INC | | | SCAC4 |
| 4144 | NNXI | NELSONS TRANSPORT INC | | | SCAC4 |
| 4145 | NNXT | NORTENO TRANSPORT | | | SCAC4 |
| 4146 | NNYI | NITTSU NEW YORK INC | | | SCAC3 |
| 4147 | NNYX | National New York Central Railroad Museum | 7/2005 (not listed) | | NAKINA |
| 4148 | NNYX | NATIONAL NEW YORK CENTRAL RAILROAD MUSEUM | | | PWRC |
| 4149 | NNYX | National New York Central Railroad Museum | | | RSRV |
| 4150 | NNYX | NATIONAL NEW YORK CENTRAL RAILROAD | | | SCAC4 |
| 4151 | NNZN | NINE NINE ZERO ZERO ZERO NINE (9900 | | | SCAC4 |
| 4152 | NO | Neos S.p.A. | ICAO: NOS, Callsign: Moonflower, IATA Prefix: 703, | I | AVCODES |
| 4153 | NO | Aus-Air (Australian Air Charterers Pty Ltd.) | ICAO: AUZ, Ceased operations | AUS | AVCODES |
| 4154 | NO | Flugfelag Nordurlands | ICAO: FNA, Callsign: Norland, Desigantor NO recalled by IATA | IS | AVCODES |
| 4155 | NO | Niger Air Cargo | ICAO: NAB, Callsign: Niger Cargo, IATA Prefix: 591, | RN | AVCODES |
| 4156 | NO | | | USA | TRAFFIC |
| 4157 | NOA | Norontair | Callsign: Norontair, | CDN | AVCODES |
| 4158 | NOA | Pantheon Airways S.A. d/b/a Olympic Air | IATA: OA, Callsign: Pantheon, IATA Prefix: 050, | GR | AVCODES |
| 4159 | NOA | National Oceanic And Atmospheric Administration | Callsign: Noaa, ICAO designator changed from NAA | USA | AVCODES |
| 4160 | NOA | Norontair | | | ICAO1 |
| 4161 | NOAB | NORTHRIDGE TRANSPORT LTD | | | SCAC4 |
| 4162 | NOAC | NORTH ATLANTIC ENTERPRISES | | | SCAC4 |
| 4163 | NOAE | NOBLE, A E, INC | | | SCAC3 |
| 4164 | NOAE | NORTHWEST MUSIC | | | SCAC4 |
| 4165 | NOAH | NOAHS CART LLC | | | SCAC4 |
| 4166 | NOAI | NORTH AMERICAN VAN LINES OF TEXAS I | | | SCAC3 |
| 4167 | NOAI | NORTH AMERICAN VAN LINES OF TEXAS I | | | SCAC4 |
| 4168 | NOAK | NORTH TO ALASKA INC | | | SCAC3 |
| 4169 | NOAK | NORTHWEST RELEASING LTD | | | SCAC4 |
| 4170 | NOAL | NINE ZERO FIVE EIGHT-SEVEN FIVE ONE | | | SCAC4 |
| 4171 | NOAM | NORTH AMERICAN VAN LINES INC | | | SCAC3 |
| 4172 | NOAO | NORTH AMERICAN TRANSPORTATION CORP | | | SCAC3 |
| 4173 | NOAO | N W SHIPPERS INC | | | SCAC4 |
| 4174 | NOAR | NORTHERN AIR CARGO INC | | | SCAC4 |
| 4175 | NOAS | NINE ONE FIVE FOUR-EIGHT FOUR ZERO | | | SCAC4 |
| 4176 | NOAT | NORTH ALABAMA TRANSPORTATION INC | | | SCAC3 |
| 4177 | NOAU | NORWEGIAN DEFENCE MATERIAL AGENCY (NDMA) | | N | BIC |
| 4178 | NOAU | HAERENS FORSYNINGSKOMMAND | | | SCAC4 |
| 4179 | NOAW | NINE ONE SEVEN SIX-FOUR TWO TWO | | | SCAC4 |
| 4180 | NOAY | NORTHERN ARTERY | | | SCAC3 |
| 4181 | NOB | Nobisair AB | Callsign: Swedline, | S | AVCODES |
| 4182 | NOB | Nord-Ostsee Bahn GmbH | Kiel (Connex-Gruppe > Veolia Verkehr) | D | privat-bahn.de |
| 4183 | NOB | Nord-Ostsee-Bahn | | D | TRAFFIC |
| 4184 | NOB | Nord-Ostsee-Bahn | | DE | VKM |
| 4185 | NOBA | NEAL OIL & AUTO CENTER INC | | | SCAC4 |
| 4186 | NOBC | NORRIS BROTHERS COMPANY | | | SCAC3 |
| 4187 | NOBD | NOBLE DISTRIBUTORS | | | SCAC3 |
| 4188 | NOBD | NORMANS TRUCKING | | | SCAC4 |
| 4189 | NOBE | NINE ZERO FOUR ONE-ONE TWO TWO FOUR | | | SCAC4 |
| 4190 | NOBG | NOBLE GROUP LIMITED | | | SCAC4 |
| 4191 | NOBH | NOBACH, RON TRUCKING INC | | | SCAC3 |
| 4192 | NOBI | NOBILES TRUCKING COMPANY | | | SCAC3 |
| 4193 | NOBI | NINE ONE ZERO SEVEN-TWO FOUR ONE TH | | | SCAC4 |
| 4194 | NOBJ | NINE ONE SEVEN EIGHT-ONE EIGHT NINE | | | SCAC4 |
| 4195 | NOBL | NOBLE, KENNETH | | | SCAC3 |
| 4196 | NOBM | NOBELL MOVING CO | | | SCAC3 |
| 4197 | NOBN | NIAGARA ORCHARD SERVICES | | | SCAC4 |
| 4198 | NOBO | NOBLE BROTHERS INC | | | SCAC3 |
| 4199 | NOBP | NOBLES SLUDGE PUMPING | | | SCAC3 |
| 4200 | NOBP | NINE ONE FIVE SEVEN-ONE FIVE ZERO F | | | SCAC4 |
