| 1 | RP | Rompetrol Logistics | RO | TRAFFIC | |
| 2 | RP | Railpro | NL | VKM | |
| 3 | RPA | Republic Airlines | IATA: RW | ICAO1 | |
| 4 | RPAC | R PACKING INC | SCAC3 | ||
| 5 | RPAC | RAVENSTAR PACIFIC SHIPPING INC | SCAC4 | ||
| 6 | RPAH | RANKIN, PAUL TRUCKING | SCAC4 | ||
| 7 | RPAR | RAMPART RENTALS INC | SCAC3 | ||
| 8 | RPAS | ROYS POOLS AND SPAS | SCAC4 | ||
| 9 | RPAT | R & P AUTOMOTIVE (TRANSPORT DIV) | SCAC4 | ||
| 10 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/1992; 1/1994 (not listed) | NAKINA | |
| 11 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/92; 1/94 | NRHS | |
| 12 | RPAX | RHODIA, INC. [(RPBX) RHONE-POULENC BASIC CHEMICALS COMPANY] | PWRC | ||
| 13 | RPAZ | RAILROAD PROPERTIES ASSOCIATES | PWRC | ||
| 14 | RPB | AeroRepública | IATA: P5 | ICAO1 | |
| 15 | RPBS | R P B SERVICE INC | SCAC3 | ||
| 16 | RPBT | RPB TRUCKING | SCAC4 | ||
| 17 | RPBX | Rhodia, Inc. | added 10/1999; 7/2000; eliminated 4/2004; added 1/2005; 7/2005 | NAKINA | |
| 18 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/1990; added 7/1991; 1/1994; eliminated 10/1999 | NAKINA | |
| 19 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/90; added 7/91; 1/94; eliminated 10/99 | NRHS | |
| 20 | RPBX | Rhodia, Inc. | added 10/99; 7/2000 | NRHS | |
| 21 | RPBX | *RHONE-POULENC BASIC CHEMICALS COMPANY | PWRC | ||
| 22 | RPBX | +RHODIA, INC. | PWRC | ||
| 23 | RPBX | Rhodia | RSRV | ||
| 24 | RPBX | RHODIA INC | SCAC4 | ||
| 25 | RPC | Aerolineas Del Pacifico | ICAO1 | ||
| 26 | RPCC | RUPP CONTRACTING CORPORATION | SCAC3 | ||
| 27 | RPCC | ROCKPORT CARRIER COMPANY INC | SCAC4 | ||
| 28 | RPCD | RAPID CITY DELIVERY | SCAC3 | ||
| 29 | RPCD | REMPEL, KEITH E | SCAC4 | ||
| 30 | RPCI | ROCKY PACIFIC SHIPPING INC | SCAC3 | ||
| 31 | RPCI | RPK TRANSPORT INC | SCAC4 | ||
| 32 | RPCL | RPC | SCAC4 | ||
| 33 | RPCN | RAPID CARTAGE INC | SCAC3 | ||
| 34 | RPCO | RAPCO DISTRIBUTING COMPANY | SCAC3 | ||
| 35 | RPCP | RING POWER CORPORATION | SCAC4 | ||
| 36 | RPCU | TIC PETERSBURG LTD | SCAC4 | ||
| 37 | RPCV | R PERSONAL COURIER SERVICE | SCAC3 | ||
| 38 | RPCX | Railroad Passenger Car Numbering Bureau Inc. | 7/2005 (not listed) | NAKINA | |
| 39 | RPCX | Robeson Process Co. | 8/1920-10/1966; eliminated 10/1969 | NAKINA | |
| 40 | RPCX | Ralston Purina Co. | added 1/1974; 1/1975-1/1980; eliminated 7/1989 | NAKINA | |
| 41 | RPCX | Robeson Process Co. | 4/38-10/66; eliminated 10/69 | NRHS | |
| 42 | RPCX | Ralston Purina Co. | added 1/74; 1/75-1/80; eliminated 7/89 | NRHS | |
| 43 | RPCX | *ROBESON PROCESS CO. | PWRC | ||
| 44 | RPCX | *RALSTON PURINA CO. | PWRC | ||
| 45 | RPCX | +RAILROAD PASSENGER CAR NUMBERING BUREAU, INC. | PWRC | ||
| 46 | RPCX | Railroad Passenger Car Numbering Bureau | RSRV | ||
| 47 | RPCX | RAILROAD PASSENGER CAR NUMBERING BU | SCAC4 | ||
| 48 | RPCX | Ralston Purina Co. | USA | TRAFFIC | |
| 49 | RPCZ | RALSTON PROTEIN CO, | PWRC | ||
| 50 | RPDA | RAPID AIR TRANSPORT INC | SCAC3 | ||
| 51 | RPDC | R P D INC | SCAC3 | ||
| 52 | RPDE | RAPID EXPRESS | SCAC3 | ||
| 53 | RPDE | RAPID EXPRESS | SCAC4 | ||
| 54 | RPDF | RAPIDO FREIGHT LINES | SCAC3 | ||
| 55 | RPDF | RAPID FREIGHT INC | SCAC4 | ||
| 56 | RPDI | ROSE, BILLY PARCEL DELIVERY SERVICE | SCAC3 | ||
| 57 | RPDJ | RAPID DELIVERY SERVICE | SCAC3 | ||
| 58 | RPDK | RIPTIDE TRUCKLING CO INC | SCAC3 | ||
| 59 | RPDL | RAPID PACKAGE DELIVERY | SCAC3 | ||
| 60 | RPDL | RAPID TRANSIT LLC | SCAC4 | ||
| 61 | RPDM | RAPID MOTOR TRANSPORT | SCAC4 | ||
| 62 | RPDO | RECUPERADORA DE METALES RIO BRAVO S | SCAC4 | ||
| 63 | RPDP | RAPID INDUSTRIAL PLASTICS CO INC | SCAC3 | ||
| 64 | RPDQ | RAPID SERVICE | SCAC3 | ||
| 65 | RPDR | RAPID TRANSIT INC | SCAC3 | ||
| 66 | RPDR | RAPID TRANSPORTATION INC | SCAC4 | ||
| 67 | RPDS | RAPIDOS SABINAS SA DE CV | SCAC4 | ||
| 68 | RPDT | RAPID TRANSIT COMPANY | SCAC3 | ||
| 69 | RPDV | RAPID DELIVERY USA | SCAC4 | ||
| 70 | RPDW | RAPID WEST INC | SCAC3 | ||
| 71 | RPDX | ROCKFORD PARK DISTRICT | PWRC | ||
| 72 | RPDY | RAYS PICKUP AND DELIVERY SERVICE | SCAC3 | ||
| 73 | RPE | RP Eisenbahn GmbH | Wachenheim (RP = Rheinland-Pfalz) | D | privat-bahn.de |
| 74 | RPE | RP Eisenbahn | DE | VKM | |
| 75 | RPEA | RP EXPRESS | SCAC4 | ||
| 76 | RPEC | REFRIESPESCIALIZADOS | SCAC4 | ||
| 77 | RPEE | R & P TRUCKING LLC | SCAC4 | ||
| 78 | RPEI | ROBICHAUD, PAUL E INC | SCAC3 | ||
| 79 | RPEI | ROBICHAUD, PAUL E INC | SCAC4 | ||
| 80 | RPEM | ROGERS PETROLEUM INC | SCAC4 | ||
| 81 | RPEN | ROYAL PACIFIC EXPRESS INC | SCAC3 | ||
| 82 | RPEP | RAPID EXPRESS DELIVERY & MESSENGER | SCAC3 | ||
| 83 | RPES | RAPID EXPRESS SERVICE INCORPORATED | SCAC3 | ||
| 84 | RPET | RPE TRANSPORTATION SERVICES | SCAC4 | ||
| 85 | RPEY | RIVERDALE POULTRY EXPRESS | SCAC4 | ||
| 86 | RPFC | ROYAL PACIFIC TRANSPORTATION LLC | SCAC4 | ||
| 87 | RPFE | RAPID FREIGHT EXPRESS INC | SCAC3 | ||
| 88 | RPFM | RAINBOW PIANO & FURNITURE MOVER INC | SCAC3 | ||
| 89 | RPFO | R P F OIL COMPANY | SCAC4 | ||
| 90 | RPGE | RIPPLINGER TRUCKING SERVICE | SCAC4 | ||
| 91 | RPGI | RAMPAK GROUP INC | SCAC4 | ||
| 92 | RPGS | ROWLANDS TRANSFER AND PIGGYBACK SER | SCAC3 | ||
| 93 | RPGT | RODRIGUEZ, P G TRUCKING | SCAC3 | ||
| 94 | RPH | Republic Express Airlines | IATA: RH | ICAO1 | |
| 95 | RPHC | R P H IRRIGATION SERVICES LTD | SCAC4 | ||
| 96 | RPHL | REFACCIONES E IMPLEMENTOS HEREDIA S | SCAC4 | ||
| 97 | RPHP | RALPHS PRODUCE | SCAC3 | ||
| 98 | RPHX | National Car Co. | 1/1952-7/1954; eliminated 1/1956 | NAKINA | |
| 99 | RPHX | National Car Co. | Jan-52 | NRHS | |
| 100 | RPHX | NATIONAL CAR CO. | PWRC |