| 1 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 7/1930-1/1980; eliminated 7/1980 | NAKINA | |
| 2 | RI | St. Paul & Kansas City Short Line R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 3 | RI | St. Paul & Des Moines R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 4 | RI | Chicago, Rock Island & Pacific Ry. | 8/1920-7/1936 | NAKINA | |
| 5 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 6 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 7 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | NRHS | |
| 8 | RI | Chicago, Rock Island & Pacific Ry. | 23-Jul | NRHS | |
| 9 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | NRHS | |
| 10 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 4/38-1/80; eliminated 7/80 | NRHS | |
| 11 | RI | ROCK ISLAND [ST. PAUL & KANSAS CITY SHORT LINE RAILROAD; DES MOINES, IOWA FALLS & NORTHERN RAILROAD; CHICAGO, ROCK ISLAND & PACIFIC RAILROAD; CHOCTAW, OKLAHOMA & GULF RAILROAD] | PWRC | ||
| 12 | RI | Chicago, Rock Island and Pacific Railroad | RSRV | ||
| 13 | RI | Chicago, Rock Island & Pacific Railway | USA | TRAFFIC | |
| 14 | RI&G | Chicago, Rock Island & Gulf Ry. | 7/1932-7/1936 | NAKINA | |
| 15 | RI&G | CHICAGO, ROCK ISLAND & GULF RWY | PWRC | ||
| 16 | RIA | Rich International Airways | ICAO1 | ||
| 17 | RIA | Islamic Republic of Iran Railways | Real: RAI | IR | TRAFFIC |
| 18 | RIAC | RICHARDSON & SONS TRUCKING CO | SCAC3 | ||
| 19 | RIAD | RITE AID CORPORATION | SCAC3 | ||
| 20 | RIAD | RIF LINE | SCAC4 | ||
| 21 | RIAF | RENTON ISSAQUAH FREIGHTLINES INC | SCAC3 | ||
| 22 | RIAF | Royal Indian Air Force | IND | TRAFFIC | |
| 23 | RIAG | RELIABLE CARTAGE INC | SCAC4 | ||
| 24 | RIAI | RIG ALL INC | SCAC3 | ||
| 25 | RIAI | RILEY, MIKE TRUCKING | SCAC4 | ||
| 26 | RIAL | RITCHEY, ALAN INC | SCAC3 | ||
| 27 | RIAL | RITCHEY, ALAN INC | SCAC4 | ||
| 28 | RIAM | RYAN INTERNATIONAL AIRLINES (MAINFR | SCAC4 | ||
| 29 | RIAN | RICHARD, NORMAN & SONS | SCAC3 | ||
| 30 | RIAS | REINANTE ARMADORA SA | SCAC3 | ||
| 31 | RIAT | R I A TRUCKINNG | SCAC3 | ||
| 32 | RIAT | RICHIE AUTO TRANSPORT INC | SCAC4 | ||
| 33 | RIBBLE | Hanson Cement Ltd. | City: Ribblesdale | GB | TRAFFIC |
| 34 | RIBC | RICE BROTHERS CARTAGE COMPANY, INC | SCAC3 | ||
| 35 | RIBK | RIBKOFF, JOSEPH INC | SCAC4 | ||
| 36 | RIBL | RICHARDS BROS TRANSPORT LTD | SCAC3 | ||
| 37 | RIBR | RICHARDSON BROTHERS | SCAC3 | ||
| 38 | RIBR | RIPLEY BROKERAGE INC | SCAC4 | ||
| 39 | RIBS | RICH, BOB-SCHROEDER TRUCKING, INC | SCAC3 | ||
| 40 | RIBS | RICH, BOB-SCHROEDER TRUCKING INC | SCAC4 | ||
| 41 | RIBT | RELIABLE TRUCKING LLC | SCAC4 | ||
| 42 | RIC | ROANOKE INDUSTRIAL CENTER | PWRC | ||
| 43 | RICB | RICHS TRANSPORTATION SERVICES INC | SCAC4 | ||
| 44 | RICC | RAM AIR GEAR DRYER | SCAC4 | ||
| 45 | RICD | RICHMOND TERMINAL TRUCKING CO, INC | SCAC3 | ||
| 46 | RICD | RICHPORTER TECHNOLOGY | SCAC4 | ||
| 47 | RICE | RICE, A C, STORAGE CORP | SCAC3 | ||
| 48 | RICE | RICE COMPANY, THE | SCAC4 | ||
| 49 | RICF | RICHFIELD LOGISTICS CORPORATION | SCAC4 | ||
| 50 | RICG | RL INTERNATIONAL CORPORATION | SCAC4 | ||
| 51 | RICH | RICHLAND TRUCKING | SCAC4 | ||
| 52 | RICI | Rail in-Club GmbH | CH | VKM | |
| 53 | RICJ | RICE TRUCKING INC | SCAC3 | ||
| 54 | RICJ | RICE TRUCKING INC | SCAC4 | ||
| 55 | RICL | RICHARDSON, LLOYD W CONSTRUCTION | SCAC3 | ||
| 56 | RICL | ROCK IT CARGO USA LLC | SCAC4 | ||
| 57 | RICM | RICHARDS MOTOR SERVICE, INC | SCAC3 | ||
| 58 | RICN | RICHARDSON TRANSFER AND STORAGE CO, | SCAC3 | ||
| 59 | RICO | RICE TRANS AND EQUIPMENT CO | SCAC3 | ||
| 60 | RICP | RICHMOND PIGEON CARRIERS, INC | SCAC3 | ||
| 61 | RICQ | RICHIE, BOSTON, DELUXE GENERAL HAULING, INC | SCAC3 | ||
| 62 | RICQ | RICKS DELIVERY | SCAC4 | ||
| 63 | RICR | RICHMOND TRANSFER AND STORAGE COMPA | SCAC3 | ||
| 64 | RICS | RIC'S TRANSFER COMPANY, INC | SCAC3 | ||
| 65 | RICS | RICS TRANSFER COMPANY INC | SCAC4 | ||
| 66 | RICU | RINNEN GMBH & CO KG INTERNATIONALE SPEDITION | PWRC | ||
| 67 | RICU | Rinnen GMBH | RSRV | ||
| 68 | RICU | RINNEN GMBH & CO KG | SCAC4 | ||
| 69 | RICW | RICHS TOWING SERVICE INC | SCAC3 | ||
| 70 | RICW | RICHS TOWING SERVICE INC | SCAC4 | ||
| 71 | RICX | Rockwell International Corp. | 1/1994-7/2005 (not listed) | NAKINA | |
| 72 | RICX | Rustless Iron Corp. of America | 7/1937-4/1961 (not listed) | NAKINA | |
| 73 | RICX | Reid Ice Cream Corp. | 7/1930 | NAKINA | |
| 74 | RICX | Rustless Iron Corp. of America | 1/52-4/61 | NRHS | |
| 75 | RICX | Rockwell International Corp. | 1/94-7/2000 | NRHS | |
| 76 | RICX | *REID ICE CREAM CORP. | PWRC | ||
| 77 | RICX | *RUSTLESS IRON CORP. OF AMERICA | PWRC | ||
| 78 | RICX | +ROCKWELL INTERNATIONAL CORPORATION | PWRC | ||
| 79 | RICX | Rockwell International Corporation | RSRV | ||
| 80 | RICX | ROCKWELL INTERNATIONAL CORPORATION | SCAC4 | ||
| 81 | RICZ | RINKER CIDCO | PWRC | ||
| 82 | RID | Ridder Avia | ICAO1 | ||
| 83 | RIDB | RICHFIELD BLOOMINGTON TRANSFER INC | SCAC3 | ||
| 84 | RIDD | RIDDLE CARTAGE, INC | SCAC3 | ||
| 85 | RIDE | RIDGE TRUCKING INC | SCAC3 | ||
| 86 | RIDE | RIDER TRUCKING LLC | SCAC4 | ||
| 87 | RIDF | RIDGEFIELD PARK TRANSPORT CO INC | SCAC3 | ||
| 88 | RIDG | RIDGE EXPRESS CO INC | SCAC3 | ||
| 89 | RIDI | RITROVATO TRUCKING | SCAC4 | ||
| 90 | RIDK | RIDINGS TRUCKING | SCAC4 | ||
| 91 | RIDM | RIDER MARINE S A | SCAC4 | ||
| 92 | RIDN | RIDDERMAN & SONS OIL CO INC | SCAC4 | ||
| 93 | RIDO | RICHERSON INC | SCAC3 | ||
| 94 | RIDP | RINEER TRANSPORT SERVICES LLC | SCAC4 | ||
| 95 | RIDS | RICKS DELIVERY SERVICE INC | SCAC3 | ||
| 96 | RIDS | REV-IT DELIVERS INC | SCAC4 | ||
| 97 | RIDT | RICHMOND TRANSPORT, INC | SCAC3 | ||
| 98 | RIDV | RENVAN INDUSTRIAL DELIVERY | SCAC3 | ||
| 99 | RIDW | RITE-WAY DELIVERY INC | SCAC3 | ||
| 100 | RIDY | RIDEWAY TRANSPORT INC | SCAC4 |