| 3901 | RHXP | RED HAWK EXPRESS INC | SCAC3 | ||
| 3902 | RHXP | ROLLING HILLS EXPRESS INC | SCAC4 | ||
| 3903 | RHXQ | RHEIN EXPRESS | SCAC3 | ||
| 3904 | RHXQ | RICH TRANSPORT INC | SCAC4 | ||
| 3905 | RHXR | R A H EXPRESS INC | SCAC3 | ||
| 3906 | RHYX | Macquarie Rail Inc. | added 7/2009 | NAKINA | |
| 3907 | RHYX | WATCO COMPANIES INC | SCAC4 | ||
| 3908 | RHYZ | RHYTHM LOGISTICS INC | SCAC4 | ||
| 3909 | RHZJ | RAMIREZ HERNANDEZ, JESUS SERGIO | SCAC4 | ||
| 3910 | RHZO | RA CHAND PRODUCTS-JUNGLE ZOO | SCAC4 | ||
| 3911 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 7/1930-1/1980; eliminated 7/1980 | NAKINA | |
| 3912 | RI | St. Paul & Kansas City Short Line R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 3913 | RI | St. Paul & Des Moines R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 3914 | RI | Chicago, Rock Island & Pacific Ry. | 8/1920-7/1936 | NAKINA | |
| 3915 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 3916 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 8/1920-7/1923 | NAKINA | |
| 3917 | RI | Choctaw, Oklahoma & Gulf R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | NRHS | |
| 3918 | RI | Chicago, Rock Island & Pacific Ry. | 23-Jul | NRHS | |
| 3919 | RI | Des Moines, Iowa Falls & Northern R.R. (Chicago, Rock Island & Pacific Ry.) | 23-Jul | NRHS | |
| 3920 | RI | Rock Island (Chicago, Rock Island & Pacific Ry. Co.) | 4/38-1/80; eliminated 7/80 | NRHS | |
| 3921 | 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 | ||
| 3922 | RI | Chicago, Rock Island and Pacific Railroad | RSRV | ||
| 3923 | RI | Chicago, Rock Island & Pacific Railway | USA | TRAFFIC | |
| 3924 | RI&G | Chicago, Rock Island & Gulf Ry. | 7/1932-7/1936 | NAKINA | |
| 3925 | RI&G | CHICAGO, ROCK ISLAND & GULF RWY | PWRC | ||
| 3926 | RIA | Rich International Airways | ICAO1 | ||
| 3927 | RIA | Islamic Republic of Iran Railways | Real: RAI | IR | TRAFFIC |
| 3928 | RIAC | RICHARDSON & SONS TRUCKING CO | SCAC3 | ||
| 3929 | RIAD | RITE AID CORPORATION | SCAC3 | ||
| 3930 | RIAD | RIF LINE | SCAC4 | ||
| 3931 | RIAF | RENTON ISSAQUAH FREIGHTLINES INC | SCAC3 | ||
| 3932 | RIAF | Royal Indian Air Force | IND | TRAFFIC | |
| 3933 | RIAG | RELIABLE CARTAGE INC | SCAC4 | ||
| 3934 | RIAI | RIG ALL INC | SCAC3 | ||
| 3935 | RIAI | RILEY, MIKE TRUCKING | SCAC4 | ||
| 3936 | RIAL | RITCHEY, ALAN INC | SCAC3 | ||
| 3937 | RIAL | RITCHEY, ALAN INC | SCAC4 | ||
| 3938 | RIAM | RYAN INTERNATIONAL AIRLINES (MAINFR | SCAC4 | ||
| 3939 | RIAN | RICHARD, NORMAN & SONS | SCAC3 | ||
| 3940 | RIAS | REINANTE ARMADORA SA | SCAC3 | ||
| 3941 | RIAT | R I A TRUCKINNG | SCAC3 | ||
| 3942 | RIAT | RICHIE AUTO TRANSPORT INC | SCAC4 | ||
| 3943 | RIBBLE | Hanson Cement Ltd. | City: Ribblesdale | GB | TRAFFIC |
| 3944 | RIBC | RICE BROTHERS CARTAGE COMPANY, INC | SCAC3 | ||
| 3945 | RIBK | RIBKOFF, JOSEPH INC | SCAC4 | ||
| 3946 | RIBL | RICHARDS BROS TRANSPORT LTD | SCAC3 | ||
| 3947 | RIBR | RICHARDSON BROTHERS | SCAC3 | ||
| 3948 | RIBR | RIPLEY BROKERAGE INC | SCAC4 | ||
| 3949 | RIBS | RICH, BOB-SCHROEDER TRUCKING, INC | SCAC3 | ||
| 3950 | RIBS | RICH, BOB-SCHROEDER TRUCKING INC | SCAC4 | ||
| 3951 | RIBT | RELIABLE TRUCKING LLC | SCAC4 | ||
| 3952 | RIC | ROANOKE INDUSTRIAL CENTER | PWRC | ||
| 3953 | RICB | RICHS TRANSPORTATION SERVICES INC | SCAC4 | ||
| 3954 | RICC | RAM AIR GEAR DRYER | SCAC4 | ||
| 3955 | RICD | RICHMOND TERMINAL TRUCKING CO, INC | SCAC3 | ||
| 3956 | RICD | RICHPORTER TECHNOLOGY | SCAC4 | ||
| 3957 | RICE | RICE, A C, STORAGE CORP | SCAC3 | ||
| 3958 | RICE | RICE COMPANY, THE | SCAC4 | ||
| 3959 | RICF | RICHFIELD LOGISTICS CORPORATION | SCAC4 | ||
| 3960 | RICG | RL INTERNATIONAL CORPORATION | SCAC4 | ||
| 3961 | RICH | RICHLAND TRUCKING | SCAC4 | ||
| 3962 | RICI | Rail in-Club GmbH | CH | VKM | |
| 3963 | RICJ | RICE TRUCKING INC | SCAC3 | ||
| 3964 | RICJ | RICE TRUCKING INC | SCAC4 | ||
| 3965 | RICL | RICHARDSON, LLOYD W CONSTRUCTION | SCAC3 | ||
| 3966 | RICL | ROCK IT CARGO USA LLC | SCAC4 | ||
| 3967 | RICM | RICHARDS MOTOR SERVICE, INC | SCAC3 | ||
| 3968 | RICN | RICHARDSON TRANSFER AND STORAGE CO, | SCAC3 | ||
| 3969 | RICO | RICE TRANS AND EQUIPMENT CO | SCAC3 | ||
| 3970 | RICP | RICHMOND PIGEON CARRIERS, INC | SCAC3 | ||
| 3971 | RICQ | RICHIE, BOSTON, DELUXE GENERAL HAULING, INC | SCAC3 | ||
| 3972 | RICQ | RICKS DELIVERY | SCAC4 | ||
| 3973 | RICR | RICHMOND TRANSFER AND STORAGE COMPA | SCAC3 | ||
| 3974 | RICS | RIC'S TRANSFER COMPANY, INC | SCAC3 | ||
| 3975 | RICS | RICS TRANSFER COMPANY INC | SCAC4 | ||
| 3976 | RICU | RINNEN GMBH & CO KG INTERNATIONALE SPEDITION | PWRC | ||
| 3977 | RICU | Rinnen GMBH | RSRV | ||
| 3978 | RICU | RINNEN GMBH & CO KG | SCAC4 | ||
| 3979 | RICW | RICHS TOWING SERVICE INC | SCAC3 | ||
| 3980 | RICW | RICHS TOWING SERVICE INC | SCAC4 | ||
| 3981 | RICX | Rockwell International Corp. | 1/1994-7/2005 (not listed) | NAKINA | |
| 3982 | RICX | Rustless Iron Corp. of America | 7/1937-4/1961 (not listed) | NAKINA | |
| 3983 | RICX | Reid Ice Cream Corp. | 7/1930 | NAKINA | |
| 3984 | RICX | Rustless Iron Corp. of America | 1/52-4/61 | NRHS | |
| 3985 | RICX | Rockwell International Corp. | 1/94-7/2000 | NRHS | |
| 3986 | RICX | *REID ICE CREAM CORP. | PWRC | ||
| 3987 | RICX | *RUSTLESS IRON CORP. OF AMERICA | PWRC | ||
| 3988 | RICX | +ROCKWELL INTERNATIONAL CORPORATION | PWRC | ||
| 3989 | RICX | Rockwell International Corporation | RSRV | ||
| 3990 | RICX | ROCKWELL INTERNATIONAL CORPORATION | SCAC4 | ||
| 3991 | RICZ | RINKER CIDCO | PWRC | ||
| 3992 | RID | Ridder Avia | ICAO1 | ||
| 3993 | RIDB | RICHFIELD BLOOMINGTON TRANSFER INC | SCAC3 | ||
| 3994 | RIDD | RIDDLE CARTAGE, INC | SCAC3 | ||
| 3995 | RIDE | RIDGE TRUCKING INC | SCAC3 | ||
| 3996 | RIDE | RIDER TRUCKING LLC | SCAC4 | ||
| 3997 | RIDF | RIDGEFIELD PARK TRANSPORT CO INC | SCAC3 | ||
| 3998 | RIDG | RIDGE EXPRESS CO INC | SCAC3 | ||
| 3999 | RIDI | RITROVATO TRUCKING | SCAC4 | ||
| 4000 | RIDK | RIDINGS TRUCKING | SCAC4 |