| 6301 | ROFP | R O STEPP TRUCKING LLC | SCAC4 | ||
| 6302 | ROFS | ROCKFORD FREIGHT SERVICE | SCAC3 | ||
| 6303 | ROFSR | FSR RAILSERVICE SRL | RO | VKM | |
| 6304 | ROFT | ROOFERS TRANSIT | SCAC3 | ||
| 6305 | ROFT | RULE ONE FOUR (14) TRANSPORT INC | SCAC4 | ||
| 6306 | ROFW | ROBINSONS FAIRWIND TRANSPORT LTD | SCAC3 | ||
| 6307 | ROG | FundaciA~^(3) Rego | ICAO1 | ||
| 6308 | ROG | Rail Operations Group | GB | TRAFFIC | |
| 6309 | ROG | Saarstahl AG (ROGESA) | DE | VKM | |
| 6310 | ROGA | ROGERS TRANSFER & STORAGE COMPANY | SCAC3 | ||
| 6311 | ROGA | ROOF BOLT EXPRESS INC | SCAC4 | ||
| 6312 | ROGB | ROGERS OIL COMPANY OF COLUMBIA INC | SCAC4 | ||
| 6313 | ROGC | ROGERS CHEVROLET CO | SCAC3 | ||
| 6314 | ROGD | ROGNESS, GLEN D TRUCKING | SCAC3 | ||
| 6315 | ROGD | RGO | SCAC4 | ||
| 6316 | ROGE | ROBLEE, GEORGE | SCAC4 | ||
| 6317 | ROGF | ROGUE SPECIALTY TRANSPORT | SCAC4 | ||
| 6318 | ROGG | ROMINGER, GEORGE TRUCKING | SCAC3 | ||
| 6319 | ROGI | ROGERS TRUCKING INC | SCAC3 | ||
| 6320 | ROGJ | RUD OIL & GAS | SCAC4 | ||
| 6321 | ROGL | ROGELIO TRUCKS | SCAC4 | ||
| 6322 | ROGM | RIO GRANDE TRANSPORTS INC | SCAC3 | ||
| 6323 | ROGN | ROGERS, J L TRUCKING | SCAC3 | ||
| 6324 | ROGO | ROGELIOS TRUCKING | SCAC3 | ||
| 6325 | ROGO | ROGELIOS TRUCKING | SCAC4 | ||
| 6326 | ROGQ | ROGER TRUCKING CO | SCAC3 | ||
| 6327 | ROGQ | ROMYLIA E N E | SCAC4 | ||
| 6328 | ROGR | ROGERS CARTAGE CO | SCAC3 | ||
| 6329 | ROGR | ROGERS CARTAGE CO | SCAC4 | ||
| 6330 | ROGU | RO CARGO, C.A. | SCAC3 | ||
| 6331 | ROGW | ROGERS TRANSFER COMPANY | SCAC3 | ||
| 6332 | ROH | Aero Gen | ICAO1 | ||
| 6333 | ROHA | ROCHA TRUCKING INCORPORATED | SCAC4 | ||
| 6334 | ROHB | ROTH BROTHERS CONTRACTORS INC | SCAC3 | ||
| 6335 | ROHC | RONALD HAULING COMPANY | SCAC3 | ||
| 6336 | ROHC | ROAD HOUSE CARRIERS INC | SCAC4 | ||
| 6337 | ROHF | ROYAL HAWAIIAN FORWARDING | SCAC3 | ||
| 6338 | ROHG | ROSE, H G MOVING & STORAGE, FLUSHIN | SCAC3 | ||
| 6339 | ROHG | RONCO OILFIELD HAULING LTD | SCAC4 | ||
| 6340 | ROHH | ROACH, HAROLD H INC | SCAC3 | ||
| 6341 | ROHJ | Ringkøbing - Ørnhøj - Holstebro Jernbane (Ørnhøjbanen) | 1925 - 1961 | DK | TRAFFIC |
| 6342 | ROHK | ROCHESTER TRUCKING INC | SCAC4 | ||
| 6343 | ROHM | ROHMER TRUCKING COMPANY | SCAC4 | ||
| 6344 | ROHN | R O H L TRANSPORT | SCAC3 | ||
| 6345 | ROHP | ROGERS, PHILLIP F | SCAC3 | ||
| 6346 | ROHP | ROHAM EXPRESS | SCAC4 | ||
| 6347 | ROHQ | ROHN, JAMES C | SCAC3 | ||
| 6348 | ROHR | ROHRBAUGH, RODNEY TRUCKING INC | SCAC4 | ||
| 6349 | ROHS | ROTH & SONS TRUCKING INC | SCAC3 | ||
| 6350 | ROHT | ROHMAN TRUCK | SCAC3 | ||
| 6351 | ROHT | RAHNS OIL & PROPANE INC | SCAC4 | ||
| 6352 | ROHV | ROCHESTER VAN & STORAGE | SCAC3 | ||
| 6353 | ROHW | ROHTSTEIN CORP | SCAC3 | ||
| 6354 | ROHW | Friedrich Rohwedder GmbH | DE | VKM | |
| 6355 | ROI | Avior Airlines | ICAO1 | ||
| 6356 | ROIF | ROI RECREATION OUTFITTERS INC | SCAC4 | ||
| 6357 | ROIH | RAMSEY OIL | SCAC4 | ||
| 6358 | ROII | RADO INTERNATIONAL INC | SCAC4 | ||
| 6359 | ROIL | RADIANT OIL C | SCAC3 | ||
| 6360 | ROIN | ROSENS INC | SCAC3 | ||
| 6361 | ROIN | ROSENS INC | SCAC4 | ||
| 6362 | ROIO | REBEL OIL CO INC | SCAC4 | ||
| 6363 | ROIP | ROCHESTER INDEPENDENT PACKER, INC | SCAC3 | ||
| 6364 | ROIQ | ROGERS, A G INC | SCAC3 | ||
| 6365 | ROIR | ROAD ISLAND RED | SCAC3 | ||
| 6366 | ROIR | ROMAN IRIBE, OSCAR | SCAC4 | ||
| 6367 | ROIT | ROBBINS TRANSPORT INC | SCAC3 | ||
| 6368 | ROIX | Shintech Inc. | added 10/1974; 1/1975-7/2000; eliminated 4/2001; 7/2005 (not listed) | NAKINA | |
| 6369 | ROIX | Shintech Inc. | added 10/74; 1/75-7/2000; eliminated 4/2001 | NRHS | |
| 6370 | ROIX | SHINTECH INC | PWRC | ||
| 6371 | ROIX | Shintech | RSRV | ||
| 6372 | ROIX | SHINTECH INC | SCAC4 | ||
| 6373 | ROJ | Royal Jet | ICAO1 | ||
| 6374 | ROJE | RONAN, J E TRUCKING | SCAC3 | ||
| 6375 | ROJF | REDS OF JAFFREY LLC | SCAC4 | ||
| 6376 | ROJH | ROSE, J H TRUCK LINE CO | SCAC3 | ||
| 6377 | ROJI | ROESNER, JIM GENERAL TRUCKING INC | SCAC3 | ||
| 6378 | ROJI | ROBERTS, ORVAL TRUCKING LTD | SCAC4 | ||
| 6379 | ROJJ | ROUNTREE, JOHN BYRUM JR | SCAC3 | ||
| 6380 | ROJM | ROMAN OIL COMPANY | SCAC4 | ||
| 6381 | ROJT | ROJO TRUCKING INC | SCAC4 | ||
| 6382 | ROJW | ROGERS, J W, INC | SCAC3 | ||
| 6383 | ROK | National Airlines | IATA: N7 | ICAO1 | |
| 6384 | ROKA | ROKA | SCAC3 | ||
| 6385 | ROKB | ROYAL TRUCKING | SCAC4 | ||
| 6386 | ROKC | ROCKY MOUNTAIN TRUCKING | SCAC3 | ||
| 6387 | ROKC | R O C TRUCKING INC | SCAC4 | ||
| 6388 | ROKE | ROANOKE OIL DISTRIBUTORS INC | SCAC4 | ||
| 6389 | ROKEM | KEMWATER CRISTAL SRL | RO | VKM | |
| 6390 | ROKG | ROYAL CITY TRUCKING | SCAC4 | ||
| 6391 | ROKL | ROK TRUCK LINES INC | SCAC3 | ||
| 6392 | ROKL | ROK LOGISTICS | SCAC4 | ||
| 6393 | ROKN | RAST, OSCAR TRUCKING CO | SCAC3 | ||
| 6394 | ROKQ | ROARK TRUCKING CO | SCAC3 | ||
| 6395 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | SCAC3 | ||
| 6396 | ROKS | ROBINSON, KARL S TRUCKING COMPANY I | SCAC4 | ||
| 6397 | ROKT | ROMEOS TRUCKING LTD | SCAC4 | ||
| 6398 | ROKX | Alpha Crushed Stone, Inc. | added 7/1972; eliminated 10/1974 | NAKINA | |
| 6399 | ROKX | Alpha Crushed Stone, Inc. | eliminated 10/74 | NRHS | |
| 6400 | ROKX | *ALPHA CRUSHED STONE, INC. | PWRC |