| 1 | ROA | Reno Air | IATA: QQ | ICAO1 | |
| 2 | ROAA | ROADEX SERVICES LTD | SCAC4 | ||
| 3 | ROAB | ROBBINS, ALLAN B | SCAC3 | ||
| 4 | ROAB | ROGERS FARM SUPPLY | SCAC4 | ||
| 5 | ROAD | ROAD COMMERCE CORPORATION | PWRC | ||
| 6 | ROAD | ROAD COMMERCE CORPORATION | SCAC3 | ||
| 7 | ROAD | ROAD LINK XPRESS | SCAC4 | ||
| 8 | ROADR | Roadrunner | City: Harlow | GB | TRAFFIC |
| 9 | ROAE | ROSS, A J LOGISTICS INC | SCAC3 | ||
| 10 | ROAE | ROAD RUNNER TRUCKING | SCAC4 | ||
| 11 | ROAF | ROAD AMERICAN FREIGHT SYSTEMS INC | SCAC3 | ||
| 12 | ROAF | Romanian Air Force | RO | TRAFFIC | |
| 13 | ROAG | ROWLAND, LONNIE TRUCKING | SCAC3 | ||
| 14 | ROAJ | ROADAIR LEASING INC | SCAC3 | ||
| 15 | ROAK | ROADKINS TRUCKING CORP | SCAC3 | ||
| 16 | ROAL | ROANE TRANSPORTATION SERVICES LLC | SCAC4 | ||
| 17 | ROAM | ROADMAS | SCAC4 | ||
| 18 | ROAN | ROANS TRUCKING SERVICE | SCAC3 | ||
| 19 | ROAN | ROANE LOGISTICS INC | SCAC4 | ||
| 20 | ROAO | ROARING EXPRESS CO INC | SCAC3 | ||
| 21 | ROAO | ROBERT FILM SERVICES INC | SCAC4 | ||
| 22 | ROAP | ROAP TRANSPORT INC | SCAC3 | ||
| 23 | ROAQ | ROAYL TRUCKING CO | SCAC3 | ||
| 24 | ROAR | ROAD AND RAIL TRUCKING COMPANY | PWRC | ||
| 25 | ROAR | ROAR LOGISTICS INC | SCAC4 | ||
| 26 | ROAT | ROES STAIR CO | SCAC4 | ||
| 27 | ROAW | ROBINSON AND WILLIAMS TRANSPORT INC | SCAC3 | ||
| 28 | ROAY | ROAD-CON SYSTEMS INC | SCAC3 | ||
| 29 | ROB | Robel | DE | VKM | |
| 30 | ROBA | ROBINSONS EXPRESS CO, INC | SCAC3 | ||
| 31 | ROBA | ROBERTS ASSOCIATES INC | SCAC4 | ||
| 32 | ROBB | ROBISON TRUCKING INC | SCAC4 | ||
| 33 | ROBC | ROBINSON CARTAGE CO | SCAC3 | ||
| 34 | ROBC | ROBINSON CARTAGE COMPANY | SCAC4 | ||
| 35 | ROBD | ROBIDEAUS EXPRESS, INC | SCAC3 | ||
| 36 | ROBD | RINGER OIL OF PA INC | SCAC4 | ||
| 37 | ROBE | ROBERTS TRUCKING CO, INC | SCAC3 | ||
| 38 | ROBE | ROBEY, JEFF TRUCK LINES INC | SCAC4 | ||
| 39 | ROBF | ROBINSON FREIGHT LINES, INC, THE | SCAC3 | ||
| 40 | ROBG | ROBERTS, GEORGE F | SCAC3 | ||
| 41 | ROBH | ROBART TRANSPORTATION INC | SCAC3 | ||
| 42 | ROBH | ROBART TRANSPORTATION INC | SCAC4 | ||
| 43 | ROBI | ROBIN TRUCK LINE | SCAC3 | ||
| 44 | ROBI | ROBIN TRUCK LINE | SCAC4 | ||
| 45 | ROBK | ROBERTS, TOM M | SCAC3 | ||
| 46 | ROBK | ROBERTS, TOM M TRUCKLINES INC | SCAC4 | ||
| 47 | ROBL | ROBERTS TRUCKING | SCAC3 | ||
| 48 | ROBL | ROBELLO TRANSPORTATION | SCAC4 | ||
| 49 | ROBM | ROBINSON TRANSPORTATION INC | SCAC3 | ||
| 50 | ROBM | ROBINSON TRANSPORTATION INC | SCAC4 | ||
| 51 | ROBN | ROBSON CO INC | SCAC3 | ||
| 52 | ROBN | ROBUST TRANSPORT SERVICES LTD | SCAC4 | ||
| 53 | ROBO | ROBEY CARTAGE COMPANY INC | SCAC3 | ||
| 54 | ROBP | ROBERTSON ENTERPRIZE INC | SCAC4 | ||
| 55 | ROBQ | ROBINSON, J AND B CARTAGE CO | SCAC3 | ||
| 56 | ROBR | ROBBINS, ROBERTA | SCAC3 | ||
| 57 | ROBS | ROBINSON TRUCKING | SCAC4 | ||
| 58 | ROBV | ROBINSON STAVE INC | SCAC4 | ||
| 59 | ROBW | ROBINSON, W T & SON TRUCKING CONTRA | SCAC3 | ||
| 60 | ROBY | ROUSES BODY SHOP INC | SCAC3 | ||
| 61 | ROBZ | ROBCO TRANSPORTATION, INC. | PWRC | ||
| 62 | ROBZ | Robco Transportation | RSRV | ||
| 63 | ROBZ | ROBCO TRANSPORTATION, INC. | SCAC4 | ||
| 64 | ROC | Rocky Mountain Airlines | ICAO1 | ||
| 65 | ROCA | R O C TRANSPORT INC | SCAC4 | ||
| 66 | ROCA | Republic of China Army | RC | TRAFFIC | |
| 67 | ROCB | ROSALES OIL COMPANY | SCAC4 | ||
| 68 | ROCD | ROCHESTER CITY DELIVERY INC | SCAC3 | ||
| 69 | ROCD | ROCHESTER CITY DELIVERY INC | SCAC4 | ||
| 70 | ROCF | ROBBINS FARMS | SCAC4 | ||
| 71 | ROCH | ROWAYTON FUEL & OIL CO INC | SCAC4 | ||
| 72 | ROCI | RANCHERS OIL CO | SCAC3 | ||
| 73 | ROCJ | ROCHE MOVING & STORAGE INC | SCAC3 | ||
| 74 | ROCK | Chicago, Rock Island and Pacific Ry. Co. | added 7/1975; 1/1980; eliminated 7/1980 | NAKINA | |
| 75 | ROCK | Chicago, Rock Island and Pacific Ry. Co. | added 7/75; 1/80; eliminated 7/80 | NRHS | |
| 76 | ROCK | CHICAGO, ROCK ISLAND & PACIFIC RAILROAD (ROCK ISLAND) | PWRC | ||
| 77 | ROCK | Chicago, Rock Island and Pacific Railroad | RSRV | ||
| 78 | ROCK | Chicago, Rock Island and Pacific Ry. Co | 1975 - 1980 | USA | TRAFFIC |
| 79 | ROCKLAND | Rockland Coaches | A Coach USA company | USA | TRAFFIC |
| 80 | ROCL | ROSS, C L INC | SCAC3 | ||
| 81 | ROCL | RAPID OCEAN CO LTD | SCAC4 | ||
| 82 | ROCM | RICH OIL COMPANY INC | SCAC4 | ||
| 83 | ROCM | Republic of China Marine Corps | RC | TRAFFIC | |
| 84 | ROCN | ROCOR TRANSPORTATION COMPANIES | SCAC3 | ||
| 85 | ROCN | RORO COMPANY LTD | SCAC4 | ||
| 86 | ROCO | ROC MOVING & STORAGE | SCAC3 | ||
| 87 | ROCO | ROC MOVING & STORAGE | SCAC4 | ||
| 88 | ROCO | X | TRAFFIC | ||
| 89 | ROCQ | ROCKFORD-AURORA MOTOR SERVICE INC | SCAC3 | ||
| 90 | ROCQ | ROAD KING & LOGISTIC INC | SCAC4 | ||
| 91 | ROCS | RIO GRANDE CARRIERS INC | SCAC4 | ||
| 92 | ROCU | AMERICAN ORIENTAL ENTERPRISES CO LT | SCAC4 | ||
| 93 | ROCV | ROCCO VAN & STORAGE CO | SCAC3 | ||
| 94 | ROCW | ROSE CITY MOVING & STORAGE INC | SCAC3 | ||
| 95 | ROCW | ROADLINK EXPRESS INC | SCAC4 | ||
| 96 | ROCX | Rocky Mountain Transportation Services | added 7/1995; 7/2000-7/2005 | NAKINA | |
| 97 | ROCX | Rock Island Improvement Co. | added 1/1979; 1/1980; eliminated 7/1980 | NAKINA | |
| 98 | ROCX | Rock Island Improvement Co. | added 1/79; 1/80; eliminated 7/80 | NRHS | |
| 99 | ROCX | Rocky Mountain Transportation Services | added 7/95; 7/2000 | NRHS | |
| 100 | ROCX | *ROCK ISLAND IMPROVEMENT COMPANY (ROCK ISLAND) | PWRC |