| 4001 | MIIY | MAR INTERMODAL INC | | | SCAC4 |
| 4002 | MIJI | MIJENN INC | | | SCAC4 |
| 4003 | MIJP | MACINNIS, J P TRUCKING LIMITED | | | SCAC4 |
| 4004 | MIK | Meerblick, S.A. | Callsign: Meerblick, | E | AVCODES |
| 4005 | MIKA | M I K CO-OP TRUCKING | | | SCAC4 |
| 4006 | MIKA | MIKADO | | CH | TRAFFIC |
| 4007 | MIKB | MIDWEST TRUCKING | | | SCAC4 |
| 4008 | MIKC | MISUGA KAIUN CO LTD | | | SCAC4 |
| 4009 | MIKI | MIKI INC | | | SCAC4 |
| 4010 | MIKI | Miki Railway | | J | TRAFFIC |
| 4011 | MIKK | MIKA TRADE & MARKETING | | | SCAC4 |
| 4012 | MIKL | MIKES LOADING SERVICE INC | | | SCAC4 |
| 4013 | MIKM | MIKUNI WILD HARVEST | | | SCAC4 |
| 4014 | MIKN | MIKUNI MEXICANA SA DE CV | | | SCAC4 |
| 4015 | MIKO | MIK TECH LTD | | | SCAC4 |
| 4016 | MIKQ | M T I CARTAGE (DIV OF TSD TRANSPORT | | | SCAC4 |
| 4017 | MIKR | MIKE & SONS OIL SERVICE INC | | | SCAC4 |
| 4018 | MIKT | MIKY TRANSPORT | | | SCAC4 |
| 4019 | MIKY | MITCHELL, MIKE | | | SCAC4 |
| 4020 | MIL | National Power Rail | | GB | TRAFFIC |
| 4021 | MILA | MILLER, ARDEN TRANSPORT | | | SCAC4 |
| 4022 | MILB | MILBURN UNIVERSAL DESIGNS | | | SCAC4 |
| 4023 | MILC | MILLER OIL COMPANY | | | SCAC4 |
| 4024 | MILD | MILLER, DAVID & SONS INC | | | SCAC4 |
| 4025 | MILE | MILLER, L W DIVERSIFIED INC | | | SCAC4 |
| 4026 | MILF | MILLER FREIGHTLINES LLC | | | SCAC4 |
| 4027 | MILJ | MRO INTEGRATED LOGISTICS LLC | | | SCAC4 |
| 4028 | MILL | MILLER TRANSPORT CO INC | | | PWRC |
| 4029 | MILL | MILLENNIUM RELOCATION SERVICES INC | | | SCAC4 |
| 4030 | MILLET | Millet SAS | Real: MISA | F | TRAFFIC |
| 4031 | MILLI | Milli Bus Enterprise | | AFG | TRAFFIC |
| 4032 | MILM | MINI-MILLS LTD | | | SCAC4 |
| 4033 | MILN | MILNE TRUCK LINES INC | | | PWRC |
| 4034 | MILN | MILLER TRUCKING INC | | | SCAC4 |
| 4035 | MILO | MILESTOCK | | | SCAC4 |
| 4036 | MILQ | MILLSOURCE INC | | | SCAC4 |
| 4037 | MILS | MILLS TRANSFER, INC | | | SCAC1 |
| 4038 | MILS | MOVE IT LOGISTICS INC | | | SCAC4 |
| 4039 | MILU | CHICAGO, MILWAUKEE, ST. PAUL & | | | SCAC3 |
| 4040 | MILU | CHICAGO, MILWAUKEE, ST. PAUL & | | | SCAC4 |
| 4041 | MILW | Soo Line R.R. Co. | 1/1994-7/2005 | | NAKINA |
| 4042 | MILW | The Milwaukee Road | added 7/1985; eliminated 4/1986 | | NAKINA |
| 4043 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | eliminated 7/1985 | | NAKINA |
| 4044 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. (Richard B. Ogilvie, Trustee) | added 1/1981 | | NAKINA |
| 4045 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | 7/1936, 1/1941-10/1966 & 1/1975-1/1980; eliminated 1/1981 | | NAKINA |
| 4046 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. | 1/52-10/66 & 1/75-1/80; eliminated 1/81 | | NRHS |
| 4047 | MILW | Chicago, Milwaukee, St. Paul and Pacific R.R. Co. (Richard B. Ogilvie, Trustee) | added 1/81 | | NRHS |
| 4048 | MILW | The Milwaukee Road | eliminated 4/86 | | NRHS |
| 4049 | MILW | Soo Line R.R. Co. | 1/94-7/2000 | | NRHS |
| 4050 | MILW | CANADIAN PACIFIC RWY [SOO LINE RAILROAD; CHICAGO, MILWAUKEE, ST. PAUL & PACIFIC RR (MILWAUKEE ROAD)] | | | PWRC |
| 4051 | MILW | Chicago, Milwaukee, St. Paul and Pacific Railroad (Canadian Pacific Railway) | | | RSRV |
| 4052 | MILW | MYRA INVESTMENTS LTD | | | SCAC4 |
| 4053 | MILW | Chicago, Milwaukee, St. Paul and Pacific Railroad | | USA | TRAFFIC |
| 4054 | MILX | General Electric Rail Services Corp. | added 1/2000; 7/2000-7/2005 | | NAKINA |
| 4055 | MILX | General Electric Railcar Services Corp. | added 7/1993; 1/1994; eliminated 1/2000 | | NAKINA |
| 4056 | MILX | Milpark Drilling Fluids | added 7/1988; eliminated 7/1993 | | NAKINA |
| 4057 | MILX | Milchem Inc. | added 4/1982; eliminated 7/1988 | | NAKINA |
| 4058 | MILX | Milchem Inc. | added 4/82; eliminated 7/88 | | NRHS |
| 4059 | MILX | Milpark Drilling Fluids | added 7/88; eliminated 7/93 | | NRHS |
| 4060 | MILX | General Electric Railcar Services Corp. | added 7/93; 1/94; eliminated 1/2000 | | NRHS |
| 4061 | MILX | General Electric Rail Services Corp. | added 1/2000; 7/2000 | | NRHS |
| 4062 | MILX | (NATX) GENERAL ELECTRIC RAILCAR SERVICES CORP. (MILPARK DRILLING FLUIDS [MILCHEM INC.]) | | | PWRC |
| 4063 | MILX | Milchem (GE Rail Services Corporation) | | | RSRV |
| 4064 | MILX | GENERAL ELECTRIC RAILCAR SERVICES C | | | SCAC4 |
| 4065 | MILY | MILLER TRUCKING LTD | | | SCAC4 |
| 4066 | MILZ | CANADIAN PACIFIC RAILWAY [SOO LINE RAILROAD] | | | PWRC |
| 4067 | MILZ | Chicago, Milwaukee, St. Paul and Pacific Railroad (Canadian Pacific Railway) | | | RSRV |
| 4068 | MILZ | SOO LINE RAILROAD | | | SCAC4 |
| 4069 | MIM | Mimino | Callsign: Mimino, | RUS | AVCODES |
| 4070 | MIM | Speedwings France SA | Callsign: Millesime, Name changed to SPARFELL France | F | AVCODES |
| 4071 | MIM | SPARFELL France SA | Callsign: Millesime, Name changed from Speedwings France SA. | F | AVCODES |
| 4072 | MIM | Mimino | | | ICAO1 |
| 4073 | MIMA | MINERVA MARINE INC | | | SCAC4 |
| 4074 | MIME | MISA METAL PROCESSING OF TENNESSEE | | | SCAC4 |
| 4075 | MIMG | MISSION MOTOR LINES | | | SCAC1 |
| 4076 | MIMG | MISSION MOTOR LINES | | | SCAC4 |
| 4077 | MIMH | METALZ IN MOTION INC | | | SCAC4 |
| 4078 | MIMQ | MID-MO LOGISTICS LLC | | | SCAC4 |
| 4079 | MIMT | MIRA MOBILE TELEVISION | | | SCAC4 |
| 4080 | MIMU | MIMU TANK LEASING BV | | B | BIC |
| 4081 | MIMV | MUDANZAS INTERNACIONALES MCS SA DE | | | SCAC4 |
| 4082 | MIMW | MILCOM TOWING | | | SCAC4 |
| 4083 | MIMX | Minera Mexico Internacional, Inc. | added 7/1978; 1/1980; eliminated 7/1987; 1/1994-7/2005 (not listed) | | NAKINA |
| 4084 | MIMX | Minera Mexico Internacional, Inc. | added 7/78; 1/80; eliminated 7/87; 1/94-7/2000 | | NRHS |
| 4085 | MIMX | MINERA MEXICO INTERNACIONAL, INC. | | | PWRC |
| 4086 | MIMX | Minera Mexico International | | | RSRV |
| 4087 | MIMX | MINERA MEXICO INTERNACIONAL, INC. | | | SCAC4 |
| 4088 | MIMZ | MINNESOTA MINING | | | PWRC |
| 4089 | MIN | Business European Airways Ltd. | Callsign: Minster, | GB | AVCODES |
| 4090 | MIN | Minerve, S.A. | IATA: IW, Callsign: Minerve, IATA Prefix: 646, Name changed to AOM - Minerve, S.A. | F | AVCODES |
| 4091 | MIN | Minor Aviation Limited | | T | AVCODES |
| 4092 | MINA | MONTREAL CARGO EXPRESS INC | | | SCAC4 |
| 4093 | MINA | Minami Aso Railway | | J | TRAFFIC |
| 4094 | MINB | MAGNO INTERNATIONAL | | | SCAC4 |
| 4095 | MIND | MINT TRANSPORTATION LTD | | | SCAC4 |
| 4096 | MINE | Minneapolis Eastern Ry. Co. | 1/1975-1/1980 | | NAKINA |
| 4097 | MINE | Minneapolis Eastern Ry. Co. | 1/75-1/80 | | NRHS |
| 4098 | MINE | MINNEAPOLIS EASTERN RAILWAY | | | PWRC |
| 4099 | MINE | Minneapolis Eastern Railway | | | RSRV |
| 4100 | MINE | MSA INC | | | SCAC4 |
