| 101 | RMCX | *READE MANUFACTURING CO., INC. | | | PWRC |
| 102 | RMCX | +REYNOLDS METALS COMPANY | | | PWRC |
| 103 | RMCX | Reynolds Metals | | | RSRV |
| 104 | RMCX | REYNOLDS METALS COMPANY | | | SCAC3 |
| 105 | RMCY | REAL MCCOY COACH LINES, THE | | | SCAC3 |
| 106 | RMCZ | *(REAZ) RETIRED 04-06-93 ATP (ACI 2356) | | | PWRC |
| 107 | RMCZ | *RINKER MATERIALS CORP. | | | PWRC |
| 108 | RMD | Air Amder S.A. | Callsign: Air Amder, | RIM | AVCODES |
| 109 | RMD | Air Amder | | | ICAO1 |
| 110 | RMDC | RMDC TRUCKING LLC | | | SCAC4 |
| 111 | RMDF | RM LOGISTIC | | | SCAC4 |
| 112 | RMDL | RAMSDELL TRUCKING COMPANY | | | SCAC3 |
| 113 | RMDQ | RETAIL MERCHANTS DELIVERY | | | SCAC3 |
| 114 | RMDQ | R AND M FREIGHT INC | | | SCAC4 |
| 115 | RMDS | REFRIGERADOS MARIA DEL CARMEN MORAL | | | SCAC4 |
| 116 | RMDW | REIMUND, WERNER | | | SCAC4 |
| 117 | RMDX | American Refrigerator Transit Co. | added 7/1962; 7/1965-4/1970; eliminated 4/1974; 1/1975-1/1980; added 7/1982; 1/1994-7/2005; eliminated 1/2010 | | NAKINA |
| 118 | RMDX | American Refrigerator Transit Co. | 7/65-4/70; eliminated 4/74; 1/75-1/80; added 7/82; 1/94-7/2000 | | NRHS |
| 119 | RMDX | (MLCX) AMERICAN REFRIGERATOR TRANSIT CO. | | | PWRC |
| 120 | RMDX | American Refrigerator Transit | | | RSRV |
| 121 | RMDX | AMERICAN REFRIGERATOR TRANSIT CO. | | | SCAC4 |
| 122 | RMDY | REMEDY EXPRESS INC | | | SCAC4 |
| 123 | RME | Armenian Airlines | IATA: R3, Callsign: Armenian, IATA Prefix: 956, Suspended operations on 15 April 2003. | AM | AVCODES |
| 124 | RME | Armenian Airlines | IATA: R3 | | ICAO1 |
| 125 | RME | Röbel/Müritz Eisenbahn GmbH | Röbel | D | privat-bahn.de |
| 126 | RME | Röbel/Müritz Eisenbahn GmbH | | DE | VKM |
| 127 | RMEA | RAME AUTOTRANSPORTES SA DE CV | | | SCAC4 |
| 128 | RMEC | RME TRANSPORTATION CO INC | | | SCAC3 |
| 129 | RMEE | ROME EXPRESS INC | | | SCAC3 |
| 130 | RMEF | ROMEO FORWARDERS INC | | | SCAC3 |
| 131 | RMEH | ROMANS ELECTRIC INC | | | SCAC4 |
| 132 | RMEI | R M E INC | | | SCAC3 |
| 133 | RMEN | RED MAPLE ENTERPRISES INC | | | SCAC4 |
| 134 | RMEO | ROMEO EXPEDITORS INC | | | SCAC3 |
| 135 | RMEO | ROMEO EXPEDITORS INC | | | SCAC4 |
| 136 | RMEP | REYMAR ENTERPRISE LLC | | | SCAC4 |
| 137 | RMEQ | READY MACHINERY & EQUIPMENT (CANADA | | | SCAC4 |
| 138 | RMER | RISELING MOTOR EXPRESS INC | | | SCAC4 |
| 139 | RMES | REMINES, WM JR | | | SCAC3 |
| 140 | RMES | R & M | | | SCAC4 |
| 141 | RMET | R M E TRANSPORT, INC | | | SCAC3 |
| 142 | RMEV | ROMANS, STEVE | | | SCAC3 |
| 143 | RMEV | ROAD MAINTENANCE EQUIPMENT AND SERV | | | SCAC4 |
| 144 | RMEW | ROYAL MOTOR EXPRESSWAYS INC | | | SCAC3 |
| 145 | RMEY | RAMEY WAREHOUSE COMPANY | | | SCAC3 |
| 146 | RMF | Royal Malaysian Air Force | Callsign: Angkasa, | MAL | AVCODES |
| 147 | RMF | Royal Malaysian Air Force | | | ICAO1 |
| 148 | RMFB | RPM MOTOR FREIGHT LTD | | | SCAC4 |
| 149 | RMFC | R M F TRUCKING CO INC | | | SCAC3 |
| 150 | RMFC | RUMFORDS CANARY LINES | | | SCAC4 |
| 151 | RMFD | ROBERTSON MOHAWK FUEL DISTRIBUTORS | | | SCAC3 |
| 152 | RMFE | ROSSI MOTOR FREIGHT | | | SCAC4 |
| 153 | RMFG | RAM MOTOR FREIGHT | | | SCAC3 |
| 154 | RMFG | RAM MOTOR FREIGHT | | | SCAC4 |
| 155 | RMFH | ROBERTS MOTOR FREIGHT INC | | | SCAC3 |
| 156 | RMFI | R & M FREIGHT INC | | | SCAC4 |
| 157 | RMFK | R M F TRUCKING CO INC | | | SCAC3 |
| 158 | RMFM | RAKHRA MUSHROOM FARM | | | SCAC4 |
| 159 | RMFN | REYNALDOS MEXICAN FOOD COMPANY | | | SCAC4 |
| 160 | RMFO | ROCKY & MARCIANO FUEL OIL INC | | | SCAC4 |
| 161 | RMFQ | ROCKET MOTOR FREIGHT LINES, INC. | | | SCAC3 |
| 162 | RMFQ | R & M TRANSFER LLC | | | SCAC4 |
| 163 | RMFR | ROGUE MOTOR FREIGHT INC | | | SCAC4 |
| 164 | RMFS | REIMER FARM SUPPLIES LTD | | | SCAC4 |
| 165 | RMFT | RMF TRUCKING INC | | | SCAC3 |
| 166 | RMFT | R & M FREIGHT INC | | | SCAC4 |
| 167 | RMFV | ROCKY MOUNTAIN FREIGHT SRVICE INC | | | SCAC3 |
| 168 | RMFY | RAYMAN MOTOR FREIGHT SYSTEMS | | | SCAC4 |
| 169 | RMG | Rumugu Air & space Nigeria Limited | Callsign: Rumugu Air, | WAN | AVCODES |
| 170 | RMG | Rumugu Air & Space Nigeria | | | ICAO1 |
| 171 | RMGB | RMGC ASSOCIATES LLC | | | SCAC4 |
| 172 | RMGE | RED MAPLE GIANT INDUSTRIAL | | | SCAC4 |
| 173 | RMGF | REMINGTON FREIGHT SERVICES | | | SCAC3 |
| 174 | RMGH | RAMADA LOGISTICS LTD | | | SCAC4 |
| 175 | RMGM | RODRIGUEZ MONSALVE, GUILLERMO ISAIA | | | SCAC4 |
| 176 | RMGQ | REDSTONE MEDIA GROUP INC | | | SCAC4 |
| 177 | RMGS | ROLLINS MOVING SYSTEMS | | | SCAC3 |
| 178 | RMGU | RESOLVE MARINE GROUP, INC. | | USA | BIC |
| 179 | RMGW | ROULETTE MANAGEMENT SERVICES LLC | | | SCAC4 |
| 180 | RMGX | The Andersons-Rail Group | added 10/2004; 7/2005 | | NAKINA |
| 181 | RMGX | Railcar, Ltd. | added 10/1989; 1/1994-7/2000; eliminated 10/2004 | | NAKINA |
| 182 | RMGX | Railcar, Ltd. | added 10/89; 1/94-7/2000 | | NRHS |
| 183 | RMGX | THE ANDERSONS-RAIL GROUP [RAILCAR LIMITED] | | | PWRC |
| 184 | RMGX | Railcar Limited | | | RSRV |
| 185 | RMGX | ANDERSONS INC, THE | | | SCAC4 |
| 186 | RMGY | RMG FAMILY SUGAR BUSH | | | SCAC4 |
| 187 | RMHA | RMH TRANSFER | | | SCAC4 |
| 188 | RMHB | RMH LOGISTICS LLC | | | SCAC4 |
| 189 | RMHC | RMH MOTOR COACH | | | SCAC3 |
| 190 | RMHD | ROCKY MOUNTAIN HOLSTEINS LTD | | | SCAC4 |
| 191 | RMHI | ROYAL MOTOR HAULAGE | | | SCAC3 |
| 192 | RMHI | RMH TRANSPORT INC | | | SCAC4 |
| 193 | RMHL | RICHMAN-HELSTROM TRUCKING INC | | | SCAC3 |
| 194 | RMHL | RICHMAN-HELSTROM TRUCKING INC | | | SCAC4 |
| 195 | RMHM | RIVERSIDE MOBILE HOME MOVERS INC | | | SCAC3 |
| 196 | RMHO | RILEYS MOBILE HOME MOVERS | | | SCAC3 |
| 197 | RMHQ | RACINE MACHINERY MOVERS | | | SCAC3 |
| 198 | RMHT | R.E.D. MOBILE HOME TRANSPORTATION | | | SCAC3 |
| 199 | RMHU | RESPIRATION ZRT | | | SCAC4 |
| 200 | RMHV | ROBERTS MOBILE HOME TRANSPORT | | | SCAC3 |
