| 201 | REF | Rendsburger Eisenbahnfreunde e.V. | Rendsburg | D | privat-bahn.de |
| 202 | REFA | REFLEN S A DE C V | | | SCAC4 |
| 203 | REFB | REPUBLIC CORPORATION OF HOUSTON TEX | | | SCAC3 |
| 204 | REFC | REEDS FUEL COMPANY | | | SCAC3 |
| 205 | REFC | REFRIGERADOS RRR | | | SCAC4 |
| 206 | REFD | REFRIGERATED FOOD SYSTEMS INC | | | SCAC4 |
| 207 | REFE | REFRIGERATED FOOD EXPRESS, INC | | | SCAC3 |
| 208 | REFE | REFRIGERATED FOOD EXPRESS INC | | | SCAC4 |
| 209 | REFER | Rede Ferroviária Nacional, E.P. | | PT | VKM |
| 210 | REFF | RESERS FINE FOODS INC | | | SCAC4 |
| 211 | REFJ | READY, FRED J INC | | | SCAC3 |
| 212 | REFJ | RAATH LINES | | | SCAC4 |
| 213 | REFL | RESORT FREIGHT LINES | | | SCAC3 |
| 214 | REFO | REFRIGERATED DELIVERY SERVICE INC | | | SCAC3 |
| 215 | REFQ | REFINERS TRANSPORT SERVICE INC | | | SCAC3 |
| 216 | REFR | REFRIGERATED TRANSPORT, INC | | | SCAC3 |
| 217 | REFS | RODRIGUEZ EXPEDITED FREIGHT SYSTEMS | | | SCAC4 |
| 218 | REFT | REDOE MOLD LIMITED | | | SCAC4 |
| 219 | REFU | PETIT FORESTIER CONTAINER NEDERLAND BV | | NL | BIC |
| 220 | REFU | REFCON B.V. REFFER ENGINEERING | | | SCAC3 |
| 221 | REFU | REFTRADE BV | | | SCAC4 |
| 222 | REFV | RUSH EXPEDITING INC | | | SCAC4 |
| 223 | REFW | REDLINE EXPRESS | | | SCAC4 |
| 224 | REG | Regourd Aviation | Callsign: Regourd, | F | AVCODES |
| 225 | REG | Regional Air Services Limited | IATA: 8N, Callsign: Regional Services, | EAT | AVCODES |
| 226 | REG | Regional Air Services | | | ICAO1 |
| 227 | REG | Regional Railways | Regional Railways was one of the three passenger sectors of British Rail created in the 1980s that existed until privatisation in the 1990s. The sector was originally called Provincial, and ran regional non-express services. | GB | TRAFFIC |
| 228 | REGA | REDIEHS, GEORGE A, COMPANY, INC | | | SCAC3 |
| 229 | REGA | REGINA TRANSPORT INC | | | SCAC4 |
| 230 | REGAL | Regal Busways | | GB | TRAFFIC |
| 231 | REGB | RAZOR ENTERPRISE INC | | | SCAC4 |
| 232 | REGBH | regiobus Hannover GmbH | Real: regiobus | D | TRAFFIC |
| 233 | REGC | REGNUM CORP | | | SCAC4 |
| 234 | REGCJ | REGIONAL SRL | | RO | VKM |
| 235 | REGE | R E G LOGISTICS INC | | | SCAC4 |
| 236 | REGF | REGION FREIGHT LLINES INC | | | SCAC3 |
| 237 | REGG | REGIONAL STORAGE & TRANSPORT INC | | | SCAC3 |
| 238 | REGH | REDEKER, GUS H JR | | | SCAC3 |
| 239 | REGH | REGHOLD CORPORATION | | | SCAC4 |
| 240 | REGH | Reg | City: Hertford | GB | TRAFFIC |
| 241 | REGI | REGIONAL AIR CARGO | | | SCAC3 |
| 242 | REGIO | Regio-Bahn | | DE | VKM |
| 243 | REGJ | RAJA ENTERPRISES | | | SCAC4 |
| 244 | REGK | REGENCY TANKERS CORPORATION NEW YOR | | | SCAC3 |
| 245 | REGK | REGENCY TANKERS CORPORATION NEW YOR | | | SCAC4 |
| 246 | REGL | READING GRAIN AND LUMBER CO | | | SCAC3 |
| 247 | REGO | REEDER, HOWARD S INC | | | SCAC3 |
| 248 | REGO | REGIO TRANSPORTES MONTEMAYOR S A DE | | | SCAC4 |
| 249 | REGP | REGIONAL PETROLEUM CORP | | | SCAC3 |
| 250 | REGP | REGALORAMA URESTY SA DE CV | | | SCAC4 |
| 251 | REGQ | RIGIONAL TRUCKING INC | | | SCAC3 |
| 252 | REGR | RED EAGLE TRANSPORT | | | SCAC4 |
| 253 | REGR | RegioRail | | F | TRAFFIC |
| 254 | REGS | REGGIES SERVICES | | | SCAC3 |
| 255 | REGS | REGATTASPORT | | | SCAC4 |
| 256 | REGT | REGIONAL TRANSPORTATION COMPANY, INC. | | | SCAC3 |
| 257 | REGU | RCL FEEDER PTE LTD | | SGP | BIC |
| 258 | REGU | REGIONAL CONTAINER LINES PTE LTD | | | SCAC4 |
| 259 | REGX | Regus Industries | | | RSRV |
| 260 | REGX | SUNNY FARMS | | | SCAC4 |
| 261 | REGY | REISH, GARY L | | | SCAC3 |
| 262 | REGY | REGENCY DISTRIBUTION LTD | | | SCAC4 |
| 263 | REH | Reach Air Medical Services | Callsign: Reachmed, | USA | AVCODES |
| 264 | REHA | REDDEN, HARVEY, INC | | | SCAC3 |
| 265 | REHA | REHAGEN RACING INC | | | SCAC4 |
| 266 | REHB | RED LION TRANSPORTATION INC | | | SCAC4 |
| 267 | REHC | R E H TRUCKING | | | SCAC4 |
| 268 | REHD | REINHOLM DRAYAGE COMPANY | | | SCAC3 |
| 269 | REHG | REHRIG PENN CO | | | SCAC4 |
| 270 | REHI | REID HOT SHOT SERVICE, INC | | | SCAC3 |
| 271 | REHL | REICHERT & HAMILTON MOVING & STORAG | | | SCAC3 |
| 272 | REHM | REHMANN TRANSPORTATION CORP | | | SCAC4 |
| 273 | REHN | RIVERS EDGE COOPERATIVE | | | SCAC4 |
| 274 | REHO | REEDY FORWARDING CO INC | | | SCAC3 |
| 275 | REHS | REINHARDT & SONS MOVING & STORAGE | | | SCAC3 |
| 276 | REHS | REINHART MOVING INC | | | SCAC4 |
| 277 | REHX | RailCar Interchange, Inc. | 7/2005 (not listed) | | NAKINA |
| 278 | REHX | RAILCAR INTERCHANGE, INC. | | | PWRC |
| 279 | REHX | RAILCAR INTERCHANGE INC | | | SCAC4 |
| 280 | REI | Ray Aviation | Callsign: Ray Aviation, | IL | AVCODES |
| 281 | REI | Ray Aviation | | | ICAO1 |
| 282 | REIA | REINARTZ TRUCKING INC | | | SCAC4 |
| 283 | REIB | REIBER, RICHARD | | | SCAC4 |
| 284 | REIC | REICH BROS LONG ISLAND MOTOR FREIGH | | | SCAC3 |
| 285 | REID | ROYAL EXPEDITING INC | | | SCAC4 |
| 286 | REIE | REIERSON TRUCKING | | | SCAC3 |
| 287 | REIE | REBERLAND EQUIPMENT INC | | | SCAC4 |
| 288 | REIF | REINSFELDER, INC | | | SCAC3 |
| 289 | REIF | Reif Bauunternehmung GmbH & Co KG | | DE | VKM |
| 290 | REIG | REISING BROTHER, INC, VALLEY STREAM | | | SCAC3 |
| 291 | REIH | REIDHEAD, LARRY N & SONS INC | | | SCAC3 |
| 292 | REIH | ROADHANDLER EXPRESS INC | | | SCAC4 |
| 293 | REII | REININGER VAN & STORAGE | | | SCAC3 |
| 294 | REII | RADIUS ENGINEERING INC | | | SCAC4 |
| 295 | REIK | RIECHMANN TRANSPORT, INC | | | SCAC3 |
| 296 | REIK | RIECHMANN TRANSPORT INC | | | SCAC4 |
| 297 | REIL | REICHERT AND SON FUEL OIL INC | | | SCAC4 |
| 298 | REIM | REIMER EXPRESS LINES LTD | | | SCAC3 |
| 299 | REIM | REIMER EXPRESS LINES LTD | | | SCAC4 |
| 300 | REIN | R E I TRANSPORT | | | SCAC4 |
