| 8201 | MSSX | American Steel & Wire Co. | 7/1937-4/1938 | | NAKINA |
| 8202 | MSSX | Minnesota Steel Co. | 8/1920-7/1932 | | NAKINA |
| 8203 | MSSX | Minnesota Steel Co. (American Steel & Wire Co.) | 7/1935 | | NAKINA |
| 8204 | MSSX | Minnesota Steel Co. (American Steel & Wire Co.) | Apr-38 | | NRHS |
| 8205 | MSSX | *AMERICAN STEEL & WIRE CO. [MINNESOTA STEEL CO.] | | | PWRC |
| 8206 | MSSX | +MSSA CO. | | | PWRC |
| 8207 | MSSX | MSSA COMPANY | | | SCAC4 |
| 8208 | MST | Aeroamistad, S.A. de C.V. | Callsign: Amistad, | MEX | AVCODES |
| 8209 | MST | Master Top Linhas Aereas Ltda | IATA: Q4, Designator Q4* recalled by IATA | BR | AVCODES |
| 8210 | MST | Master Top Linhas Aereas Ltda | IATA: BM, Callsign: Master, IATA Prefix: 207, | BR | AVCODES |
| 8211 | MST | Martin Steinbrecher GmbH | | DE | VKM |
| 8212 | MSTAR | Miejski Zakład Komunikacyjny w Starachowicach | | PL | TRAFFIC |
| 8213 | MSTB | MACKENZIE, | | | SCAC4 |
| 8214 | MSTC | MISTLETOE TEX-PACK EXPRESS, INC | | | SCAC1 |
| 8215 | MSTC | Mamers StCalais | | F | TRAFFIC |
| 8216 | MSTD | MASON TRANSPORT SERVICES LTD | | | SCAC4 |
| 8217 | MSTE | MUSTEE, E L & SONS INC | | | SCAC4 |
| 8218 | MSTG | MAINSTREAM TRANSPORTATION INC | | | SCAC4 |
| 8219 | MSTH | MST | | | SCAC4 |
| 8220 | MSTJ | MSTL INC | | | SCAC4 |
| 8221 | MSTK | M & S TRUCKING | | | SCAC4 |
| 8222 | MSTL | Union Pacific R.R. Co. | added 10/1995; 7/2000-7/2005 | | NAKINA |
| 8223 | MSTL | Chicago and North Western Ry. Co. | added 1/1995; eliminated 10/1995 | | NAKINA |
| 8224 | MSTL | Chicago and North Western Transportation Co. | 1/1975-1/1994; eliminated 1/1995 | | NAKINA |
| 8225 | MSTL | Minneapolis & St. Louis Ry. Co. (Chicago and North Western Ry. Co.) | 7/1965-10/1966 | | NAKINA |
| 8226 | MSTL | Chicago & North Western Ry. | 4/1961 | | NAKINA |
| 8227 | MSTL | Chicago & North Western Ry. | Apr-61 | | NRHS |
| 8228 | MSTL | Minneapolis & St. Louis Ry. Co. (Chicago and North Western Ry. Co.) | 7/65-10/66 | | NRHS |
| 8229 | MSTL | Chicago and North Western Transportation Co. | 1/75-1/94; eliminated 1/95 | | NRHS |
| 8230 | MSTL | Chicago and North Western Ry. Co. | added 1/95; eliminated 10/95 | | NRHS |
| 8231 | MSTL | Union Pacific R.R. Co. | added 10/95; 7/2000 | | NRHS |
| 8232 | MSTL | UP [CHICAGO & NORTH WESTERN TRANS CO.; MINNEAPOLIS & ST. LOUIS RWY.] | | | PWRC |
| 8233 | MSTL | Minneapolis and St. Louis Railway (Union Pacific Railroad) | | | RSRV |
| 8234 | MSTL | Minneapolis & St.Louis | | USA | TRAFFIC |
| 8235 | MSTM | MARTEL, S TRANSPORT INC | | | SCAC4 |
| 8236 | MSTM | Mödlinger Stadtverkehrsmuseum | | A | TRAFFIC |
| 8237 | MSTP | MICHIGAN STATE TRUST FOR RAILWAY PRESERVATION | | | PWRC |
| 8238 | MSTQ | MUSTIQUE SPORTSWEAR | | | SCAC4 |
| 8239 | MSTR | The Massena Terminal R.R. Co. | 1/1975; eliminated 1/1979; 1/1980-1/1994; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 8240 | MSTR | The Massena Terminal R.R. Co. | 1/75; eliminated 1/79; 1/80-1/94; eliminated 4/97; 7/2000 | | NRHS |
| 8241 | MSTR | MASSENA TERMINAL RAILROAD COMPANY | | | PWRC |
| 8242 | MSTR | Massena Terminal Railroad | | | RSRV |
| 8243 | MSTU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 8244 | MSTV | METROPOLITAN STEVEDORE | | | PWRC |
| 8245 | MSU | MGC Aviation t/a Maluti Sky | IATA: 7D, Callsign: Maluti Sky, | LS | AVCODES |
| 8246 | MSU | METROPOLITAN SUBURBAN BUS AUTHORITY | | | SCAC4 |
| 8247 | MSUA | MCDONALD, SUSAN | | | SCAC4 |
| 8248 | MSUG | MASA TRUCKING | | | SCAC4 |
| 8249 | MSUK | MSR TRUCKING INC | | | SCAC4 |
| 8250 | MSUR | MASUR TRUCKING, INC | | | SCAC1 |
| 8251 | MSUS | MOSS TOURS INC | | | SCAC4 |
| 8252 | MSUT | MANSUR TRUCKING INC | | | SCAC4 |
| 8253 | MSUU | M/S CONTAINERS A/S | | DK | BIC |
| 8254 | MSUU | (UPCX) USPCI, INC. | | | PWRC |
| 8255 | MSUU | M/S Containers | | | RSRV |
| 8256 | MSUU | M/S CONTAINERS APS | | | SCAC4 |
| 8257 | MSUY | MASTER INDUSTRIAL SUPPLY | | | SCAC4 |
| 8258 | MSV | Aero-Kamov, Affiliated Company | Callsign: Aerafkam, | RUS | AVCODES |
| 8259 | MSV | Aero-Kamov | | | ICAO1 |
| 8260 | MSV | Mississippi & Skuna Valley R.R. Co. | added 7/1974; 1/1975-7/2005 | | NAKINA |
| 8261 | MSV | Mississippi & Skuna Valley R.R. Co. | added 7/74; 1/75-7/2000 | | NRHS |
| 8262 | MSV | MISSISSIPPI & SKUNA VALLEY RAILROAD COMPANY | | | PWRC |
| 8263 | MSV | Mississippi and Skuna Valley Railroad | | | RSRV |
| 8264 | MSVD | MULTI-SERVICIOS-Q | | | SCAC4 |
| 8265 | MSVF | M & S SERVICES | | | SCAC4 |
| 8266 | MSVI | MOTOR SERVICE INC | | | SCAC4 |
| 8267 | MSVL | M STEVE LOGISTICS | | | SCAC4 |
| 8268 | MSVM | MARSHA | | | SCAC4 |
| 8269 | MSVN | MAESTROVISION | | | SCAC4 |
| 8270 | MSVO | MS VOGE MAJA INC | | | SCAC4 |
| 8271 | MSVQ | MOSSER, STEVE INC | | | SCAC4 |
| 8272 | MSVS | M & M SERVICES | | | SCAC4 |
| 8273 | MSVU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 8274 | MSVU | A P MOLLER | | | SCAC4 |
| 8275 | MSVY | MILLER & SONS DELIVERY | | | SCAC4 |
| 8276 | MSW | South-West-Avia | Callsign: Moldwest, | MD | AVCODES |
| 8277 | MSW | Master Airways | | | ICAO1 |
| 8278 | MSWA | MARSHA | | | SCAC4 |
| 8279 | MSWC | M S W CONSTRUCTION INC | | | SCAC4 |
| 8280 | MSWD | MEUNERIE SAWYERVILLE CORP | | | SCAC4 |
| 8281 | MSWF | MARTINS, STEVE WORKING WILDLIFE INC | | | SCAC4 |
| 8282 | MSWI | MTS OF WISCONSIN LTD | | | SCAC4 |
| 8283 | MSWI | Przedsiębiorstwo Komunikacji Miejskiej, Międzygminna Sp. z o.o. | City: Świerklaniec | PL | TRAFFIC |
| 8284 | MSWL | MSW LLC | | | SCAC4 |
| 8285 | MSWM | MID SOUTH WAREHOUSE INC | | | SCAC4 |
| 8286 | MSWN | MCCOLLISTERS TRANSPORTATION SYSTEMS | | | SCAC4 |
| 8287 | MSWO | MOUNTAIN STATES | | | SCAC4 |
| 8288 | MSWP | M & S TRANSPORT LLC | | | SCAC4 |
| 8289 | MSWU | MAERSK A/S | | DK | BIC |
| 8290 | MSWU | A P MOLLER | | | SCAC4 |
| 8291 | MSWY | Minnesota Southern Ry., Inc. | 7/2005 | | NAKINA |
| 8292 | MSWY | MINNESOTA SOUTHERN RAILWAY | | | PWRC |
| 8293 | MSWY | Minnesota Southern Railway | | | RSRV |
| 8294 | MSWY | MINNESOTA SOUTHERN RAILWAY INC | | | SCAC4 |
| 8295 | MSX | Egyptair Cargo | Callsign: Egyptair Cargo, | ET | AVCODES |
| 8296 | MSX | Egyptair Cargo | | | ICAO1 |
| 8297 | MSX | Morton Salt Co. | 7/1954-4/1961; eliminated 10/1964 | | NAKINA |
| 8298 | MSX | Mutual Sales Co. | 8/1920 | | NAKINA |
| 8299 | MSX | Morton Salt Co. | 10/57-4/61 | | NRHS |
| 8300 | MSX | *MUTUAL SALES CO. | | | PWRC |
