| 1 | MIS | Midstate Airlines, Inc. | Callsign: Midstate, | USA | AVCODES |
| 2 | MIS | Air Strabing | IATA: IU, | D | AVCODES |
| 3 | MIS | Midstate Airlines | | | ICAO1 |
| 4 | MIS | Mississippi Central R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 5 | MIS | Mississippi Central R.R. Co. | 1/94-7/2000 | | NRHS |
| 6 | MIS | MISSISSIPPI CENTRAL RAILROAD | | | PWRC |
| 7 | MIS | Mississippi Central Railroad | | | RSRV |
| 8 | MIS | SILVANIA INTERNATIONAL PROD. SRL | | RO | VKM |
| 9 | MISA | MISC AGENCIES (NETHERLANDS) BV | | | SCAC4 |
| 10 | MISA | Millet SAS | | FR | VKM |
| 11 | MISC | MISFITS | | | SCAC4 |
| 12 | MISC | Mississipi Central | | USA | TRAFFIC |
| 13 | MISD | MIAS TRANSPORTS | | | SCAC4 |
| 14 | MISH | MISSISSIPPI TRANSPORTERS INC | | | SCAC4 |
| 15 | MISI | MECHANICAL INSULATION SUPPLY INC | | | SCAC4 |
| 16 | MISJ | MINORITY INTERMODAL SPECIALISTS INC | | | SCAC4 |
| 17 | MISK | MISL TRANSPORT INC | | | SCAC4 |
| 18 | MISL | MISL TRANSPORT INC (TRUCKLOAD DIVIS | | | SCAC4 |
| 19 | MISN | MULTIPLES INTERNATIONAL SERVICES LL | | | SCAC4 |
| 20 | MISO | MID STATE OIL TOOLS INC | | | SCAC4 |
| 21 | MISR | MILLER TRUCK & STORAGE COMPANY | | | SCAC4 |
| 22 | MISS | The Mississippian Ry. Cooperative, Inc. | added 1/1987; 1/1994-7/2005 | | NAKINA |
| 23 | MISS | The Mississippian Ry., Inc. | added 1/1981; eliminated 1/1987 | | NAKINA |
| 24 | MISS | Mississippian | 1/1975-1/1980 | | NAKINA |
| 25 | MISS | Mississippian | 1/75-1/80 | | NRHS |
| 26 | MISS | The Mississippian Ry., Inc. | added 1/81; eliminated 1/87 | | NRHS |
| 27 | MISS | The Mississippian Ry. Cooperative, Inc. | added 1/87; 1/94-7/2000 | | NRHS |
| 28 | MISS | (MSRW) MISSISSIPPIAN RAILWAY COOPERATIVE, INC. | | | PWRC |
| 29 | MISS | Mississippian Railway Cooperative | | | RSRV |
| 30 | MISS | MISSISSIPPI | | | SCAC4 |
| 31 | MISS | Mississauga Transit | City: Mississauga | CDN | TRAFFIC |
| 32 | MIST | MERRILL IRON & STEEL SERVICES LLC | | | SCAC4 |
| 33 | MISU | MIOULIO SHIPPING COMPANY LIMITED | | CY | BIC |
| 34 | MISU | MALAYSIAN INTERNATIONAL SHIPPING CORP. | | | PWRC |
| 35 | MISU | Malaysian International Shipping Corporation | | | RSRV |
| 36 | MISU | MALAYSIAN INTL SHIPPING CORPORATION | | | SCAC4 |
| 37 | MISX | Milwaukee Solvents & Chemicals Corp. | added 1/1974; 1/1975-1/1994; 7/2000 (not listed) | | NAKINA |
| 38 | MISX | Milwaukee Solvents & Chemicals Corp. | added 1/74; 1/75-7/2000 | | NRHS |
| 39 | MISX | MILWAUKEE SOLVENTS & CHEMICALS CORP. | | | PWRC |
| 40 | MISX | Milwaukee Solvents and Chemicals Corporation | | | RSRV |
| 41 | MISX | MI LLC | | | SCAC4 |
| 42 | MISY | MILLS INDUSTRIAL SUPPLY 1996 LTD | | | SCAC4 |
