| 8701 | RSR | Rochester and Southern Railroad | | | RSRV |
| 8702 | RSRB | RISING SON RECORDS | | | SCAC4 |
| 8703 | RSRC | RESOURCE TRANSPORT INC | | | SCAC4 |
| 8704 | RSRD | REISNER DISTRIBUTING INC | | | SCAC4 |
| 8705 | RSRE | R S R ENTERPRISES LTD | | | SCAC3 |
| 8706 | RSRE | RS RUSH TRANSFER XPRESS INC | | | SCAC4 |
| 8707 | RSRG | ROSERIDGE TRUCKING INC | | | SCAC4 |
| 8708 | RSRI | REVERE SMELTING & REFINING CORP | | | SCAC3 |
| 8709 | RSRI | RICER CO INC | | | SCAC4 |
| 8710 | RSRK | ROBINSON, RICKY | | | SCAC3 |
| 8711 | RSRL | ROIATTI SRL | | | SCAC4 |
| 8712 | RSRM | RSR MOTORSPORTS | | | SCAC4 |
| 8713 | RSRO | REFRIGERADOS SAN ROBERTO SA DE CV | | | SCAC4 |
| 8714 | RSRP | ROADSTAR TRANSPORT COMPANY LTD | | | SCAC4 |
| 8715 | RSRQ | ROSE STAR TRANSPORTATION LLC | | | SCAC4 |
| 8716 | RSRU | NORFOLK SOUTHERN RAILWAY COMPANY | | | PWRC |
| 8717 | RSRX | Revere Sugar Refinery | 1/1943-4/1947; added 4/1953; 7/1954-1/1975; eliminated 1/1979 | | NAKINA |
| 8718 | RSRX | *REVERE SUGAR REFINERY | | | PWRC |
| 8719 | RSRX | *RIMROCK SCENIC RAIL TOURS | | | PWRC |
| 8720 | RSRX | REVERE SUGAR REFINERY | | | SCAC3 |
| 8721 | RSRY | RAYS SEPTIC & ROOTER SERVICES LTD | | | SCAC4 |
| 8722 | RSRZ | (NS) RETIRED 04-06-93 ATP | | | PWRC |
| 8723 | RSRZ | Norfolk Southern Railway | | | RSRV |
| 8724 | RSS | Rossair (Pty) Ltd. | Callsign: Ross Charter, | ZA | AVCODES |
| 8725 | RSS | Rossair | | | ICAO1 |
| 8726 | RSS | Rockdale, Sandow & Southern R.R. Co. | 1/1975-1/1980; added 7/1980; 1/1994-7/2005 | | NAKINA |
| 8727 | RSS | Rockdale, Sandow & Southern R.R. Co. | 1/75-1/80; added 7/80; 1/94-7/2000 | | NRHS |
| 8728 | RSS | *ROCHESTER SUBWAY | | | PWRC |
| 8729 | RSS | +ROCKDALE, SANDOW & SOUTHERN RAILROAD CO. | | | PWRC |
| 8730 | RSS | Rochester Subway (Rockdale, Sandow and Southern Railroad) | | | RSRV |
| 8731 | RSSA | ROADMASTER TRANSPORTATION, INC. | | | SCAC3 |
| 8732 | RSSA | ROADMASTER TRANSPORTATION INC | | | SCAC4 |
| 8733 | RSSB | ROSS BROTHERS | | | SCAC3 |
| 8734 | RSSC | ROSSI CARTAGE INC | | | SCAC3 |
| 8735 | RSSC | REGENT SEVEN SEAS CRUISES INC | | | SCAC4 |
| 8736 | RSSE | ROSSI CORPORATION | | | SCAC4 |
| 8737 | RSSF | RUSSELL FARMS | | | SCAC3 |
| 8738 | RSSH | ROSARIO SHIPPING AND TRADING S.A. | | | SCAC3 |
| 8739 | RSSH | RILEY-SHERMA | | | SCAC4 |
| 8740 | RSSI | ROSES STORES NC | | | SCAC3 |
| 8741 | RSSJ | RTJ SPECIALIZED SERVICES | | | SCAC4 |
| 8742 | RSSK | ROSS, KENNETH TRUCKING | | | SCAC3 |
| 8743 | RSSK | RAMOS SEVEN SEVEN SEVEN (777) TRUCK | | | SCAC4 |
| 8744 | RSSL | ROSSEE OIL CO INC | | | SCAC4 |
| 8745 | RSSM | ROSS STEEL & TRANSPORTATION INC | | | SCAC3 |
| 8746 | RSSN | ROUSSEAU METAL INC | | | SCAC4 |
| 8747 | RSSO | R & S STORES INC, | | | SCAC3 |
| 8748 | RSSP | REDDING SEED AND SUPPLY INC | | | SCAC3 |
| 8749 | RSSQ | RS SHIPPING SRL | | | SCAC4 |
| 8750 | RSSR | ROSSI TRANSPORTATION COMPANY | | | SCAC3 |
| 8751 | RSSR | RESSLER, ROY & SON INC | | | SCAC4 |
| 8752 | RSSS | ROSSMANN SHIPPING SERVICES | | | SCAC3 |
| 8753 | RSST | ROSS TRUCKING COMPANY | | | SCAC3 |
| 8754 | RSSU | ROYAL WOLF TRADING AUSTRALIA PTY LTD | | AUS | BIC |
| 8755 | RSSU | ROYAL WOLF TRADING AUSTRALIA PTY LT | | | SCAC4 |
| 8756 | RSSV | RUMFORD SHUTTLE SERVICE | | | SCAC3 |
| 8757 | RSSW | RAY SEA SA | | | SCAC4 |
| 8758 | RSSX | Railserve, Inc. | 7/2005 (not listed) | | NAKINA |
| 8759 | RSSX | *RAIL SWITCHING SERVICE, INC. | | | PWRC |
| 8760 | RSSX | +RAILSERVE, INC. | | | PWRC |
| 8761 | RSSX | Railserve Inc. | | | RSRV |
| 8762 | RSSX | RAILSERVE INC | | | SCAC4 |
| 8763 | RSSY | RGL SPECIALTY SERVICES LLC | | | SCAC4 |
| 8764 | RST | Resort Air | Callsign: Resort Air, | USA | AVCODES |
| 8765 | RST | Resort Air | | | ICAO1 |
| 8766 | RST | Rangier-, Servce- und Transportgesellschaft mbH | St. Ingbert | D | privat-bahn.de |
| 8767 | RSTA | ROSSI TRANSPORT SERVICE, INC. | | | SCAC3 |
| 8768 | RSTB | R & S TRUCKING | | | SCAC3 |
| 8769 | RSTB | RST | | | SCAC4 |
| 8770 | RSTC | ROSE TRUCKING INCORPORATED | | | SCAC3 |
| 8771 | RSTD | RST INDUSTRIES LTD | | | SCAC3 |
| 8772 | RSTE | RICE STREET TOWING INC | | | SCAC3 |
| 8773 | RSTE | RED STAR FUELS | | | SCAC4 |
| 8774 | RSTF | REIS TRUCKING INC | | | SCAC3 |
| 8775 | RSTF | REIS TRUCKING INC | | | SCAC4 |
| 8776 | RSTG | R & S TRUCKING INC | | | SCAC3 |
| 8777 | RSTG | R & S TRUCKING | | | SCAC4 |
| 8778 | RSTH | ROSE TRANSPORTATION CO | | | SCAC3 |
| 8779 | RSTI | R S TRUCKING CO | | | SCAC3 |
| 8780 | RSTI | RISING STAR TRANSPORTATION INC | | | SCAC4 |
| 8781 | RSTJ | R & S TRUCKING | | | SCAC3 |
| 8782 | RSTK | REESE TRUCKING | | | SCAC4 |
| 8783 | RSTK | Rolling Stock Company | | RO | TRAFFIC |
| 8784 | RSTL | R S TRAILER REPAIR INC | | | SCAC3 |
| 8785 | RSTL | RST INDUSTRIES LIMITED | | | SCAC4 |
| 8786 | RSTM | R & S TRANSPORTERS INTERMODAL SERVI | | | SCAC4 |
| 8787 | RSTN | REASNOR & SON TRUCKING | | | SCAC3 |
| 8788 | RSTN | R & S TRUCKING | | | SCAC4 |
| 8789 | RSTO | RELIABLE-SCOTT TRANSPORT LIMITED | | | SCAC3 |
| 8790 | RSTP | RELIABLE SOUTHERN TRANSPORT INC | | | SCAC4 |
| 8791 | RSTQ | RISS TRANSPORTATION CO | | | SCAC3 |
| 8792 | RSTQ | ROSE, STEVE | | | SCAC4 |
| 8793 | RSTR | R & S TRANSPORT | | | SCAC3 |
| 8794 | RSTR | R M S TRANSPORT LLC | | | SCAC4 |
| 8795 | RSTS | Ruhr-Stickstoff AG | | D | TRAFFIC |
| 8796 | RSTU | UNIT45 BV | | NL | BIC |
| 8797 | RSTU | UNIT 45 BV | | | SCAC4 |
| 8798 | RStV | Rinteln - Stadthagener Verkehrs GmbH | Celle | D | privat-bahn.de |
| 8799 | RSTV | R AND S TRUCKING INC (NC CORP) | | | SCAC3 |
| 8800 | RSTV | Rinteln-Stadthagener Verkehrsbetriebe | | D | TRAFFIC |
