| 1 | RP | Chautauqua Airlines, Inc. d/b/a USAir Express | ICAO: CHQ, Callsign: Chautauqua, IATA Prefix: 363, IATA designator changed from US*. Founded in 1973. Merged into Shuttle America (S5/TCF) on 31 December 2014. | USA | AVCODES |
| 2 | RP | M. robert Petrelluzzi, Antilles Air Service | Callsign: Petrel, | F | AVCODES |
| 3 | RP | Budapest Aircraft Service Ltd. | ICAO: BPS, Callsign: Base, | H | AVCODES |
| 4 | RP | Rompetrol Logistics | | RO | TRAFFIC |
| 5 | RP | Railpro | | NL | VKM |
| 6 | RPA | Provence Aero Service | Callsign: Airpass, | F | AVCODES |
| 7 | RPA | Republic Airline, Inc. | IATA: RW, Callsign: Brickyard, Designator RW* recalled by IATA | USA | AVCODES |
| 8 | RPA | Republic Airline, Inc. | Callsign: Brickyard, Designator RW* recalled by IATA | USA | AVCODES |
| 9 | RPA | Republic Airline, Inc. | IATA: YX, Callsign: Brickyard, IATA Prefix: 453, Designator RW* recalled by IATA | USA | AVCODES |
| 10 | RPA | Republic Airlines | IATA: RW | | ICAO1 |
| 11 | RPAC | R PACKING INC | | | SCAC3 |
| 12 | RPAC | RAVENSTAR PACIFIC SHIPPING INC | | | SCAC4 |
| 13 | RPAH | RANKIN, PAUL TRUCKING | | | SCAC4 |
| 14 | RPAR | RAMPART RENTALS INC | | | SCAC3 |
| 15 | RPAS | ROYS POOLS AND SPAS | | | SCAC4 |
| 16 | RPAT | R & P AUTOMOTIVE (TRANSPORT DIV) | | | SCAC4 |
| 17 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/1992; 1/1994 (not listed) | | NAKINA |
| 18 | RPAX | Rhone-Poulenc Basic Chemicals Co. | eliminated 10/92; 1/94 | | NRHS |
| 19 | RPAX | RHODIA, INC. [(RPBX) RHONE-POULENC BASIC CHEMICALS COMPANY] | | | PWRC |
| 20 | RPAZ | RAILROAD PROPERTIES ASSOCIATES | | | PWRC |
| 21 | RPB | AeroRepública, S.A. | IATA: P5, Callsign: Aerorepublica, IATA Prefix: 845, Name changed to Aero Republica, S.A. t/a Copa Airlines Colombia w.e.f. October 2010. Designator P5 reinstated by IATA | CO | AVCODES |
| 22 | RPB | AeroRepública, S.A. t/a Copa Airlines Colombia | IATA: P5, Callsign: Aerorepublica, IATA Prefix: 845, Name changed to AeroRep�blica, S.A. t/a wingo. Name changed from Aero Republica, S.A. Designator P5 reinstated by IATA | CO | AVCODES |
| 23 | RPB | AeroRepública, S.A. t/a wingo | IATA: P5, Callsign: Aerorepublica, IATA Prefix: 845, Name changed from Copa Airlines Colombia and previously from Aero Republica, S.A. Designator P5 reinstated by IATA | CO | AVCODES |
| 24 | RPB | AeroRepública | IATA: P5 | | ICAO1 |
| 25 | RPBS | R P B SERVICE INC | | | SCAC3 |
| 26 | RPBT | RPB TRUCKING | | | SCAC4 |
| 27 | RPBU | BTT MULTIMODAL CONTAINER SOLUTION B.V. | | NL | BIC |
| 28 | RPBX | Rhodia, Inc. | added 10/1999; 7/2000; eliminated 4/2004; added 1/2005; 7/2005 | | NAKINA |
| 29 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/1990; added 7/1991; 1/1994; eliminated 10/1999 | | NAKINA |
| 30 | RPBX | Rhone-Poulenc Basic Chemicals Co. | added 4/90; added 7/91; 1/94; eliminated 10/99 | | NRHS |
| 31 | RPBX | Rhodia, Inc. | added 10/99; 7/2000 | | NRHS |
| 32 | RPBX | *RHONE-POULENC BASIC CHEMICALS COMPANY | | | PWRC |
| 33 | RPBX | +RHODIA, INC. | | | PWRC |
| 34 | RPBX | Rhodia | | | RSRV |
| 35 | RPBX | RHODIA INC | | | SCAC4 |
| 36 | RPC | Aerolineas Del Pacifico | | | ICAO1 |
| 37 | RPCC | RUPP CONTRACTING CORPORATION | | | SCAC3 |
| 38 | RPCC | ROCKPORT CARRIER COMPANY INC | | | SCAC4 |
| 39 | RPCD | RAPID CITY DELIVERY | | | SCAC3 |
| 40 | RPCD | REMPEL, KEITH E | | | SCAC4 |
| 41 | RPCI | ROCKY PACIFIC SHIPPING INC | | | SCAC3 |
| 42 | RPCI | RPK TRANSPORT INC | | | SCAC4 |
| 43 | RPCL | RPC | | | SCAC4 |
| 44 | RPCN | RAPID CARTAGE INC | | | SCAC3 |
| 45 | RPCO | RAPCO DISTRIBUTING COMPANY | | | SCAC3 |
| 46 | RPCP | RING POWER CORPORATION | | | SCAC4 |
| 47 | RPCU | TIC PETERSBURG LTD | | | SCAC4 |
| 48 | RPCV | R PERSONAL COURIER SERVICE | | | SCAC3 |
| 49 | RPCX | Railroad Passenger Car Numbering Bureau Inc. | 7/2005 (not listed) | | NAKINA |
| 50 | RPCX | Robeson Process Co. | 8/1920-10/1966; eliminated 10/1969 | | NAKINA |
| 51 | RPCX | Ralston Purina Co. | added 1/1974; 1/1975-1/1980; eliminated 7/1989 | | NAKINA |
| 52 | RPCX | Robeson Process Co. | 4/38-10/66; eliminated 10/69 | | NRHS |
| 53 | RPCX | Ralston Purina Co. | added 1/74; 1/75-1/80; eliminated 7/89 | | NRHS |
| 54 | RPCX | *ROBESON PROCESS CO. | | | PWRC |
| 55 | RPCX | *RALSTON PURINA CO. | | | PWRC |
| 56 | RPCX | +RAILROAD PASSENGER CAR NUMBERING BUREAU, INC. | | | PWRC |
| 57 | RPCX | Railroad Passenger Car Numbering Bureau | | | RSRV |
| 58 | RPCX | RAILROAD PASSENGER CAR NUMBERING BU | | | SCAC4 |
| 59 | RPCX | Ralston Purina Co. | | USA | TRAFFIC |
| 60 | RPCZ | RALSTON PROTEIN CO, | | | PWRC |
| 61 | RPDA | RAPID AIR TRANSPORT INC | | | SCAC3 |
| 62 | RPDC | R P D INC | | | SCAC3 |
| 63 | RPDE | RAPID EXPRESS | | | SCAC3 |
| 64 | RPDE | RAPID EXPRESS | | | SCAC4 |
| 65 | RPDF | RAPIDO FREIGHT LINES | | | SCAC3 |
| 66 | RPDF | RAPID FREIGHT INC | | | SCAC4 |
| 67 | RPDI | ROSE, BILLY PARCEL DELIVERY SERVICE | | | SCAC3 |
| 68 | RPDJ | RAPID DELIVERY SERVICE | | | SCAC3 |
| 69 | RPDK | RIPTIDE TRUCKLING CO INC | | | SCAC3 |
| 70 | RPDL | RAPID PACKAGE DELIVERY | | | SCAC3 |
| 71 | RPDL | RAPID TRANSIT LLC | | | SCAC4 |
| 72 | RPDM | RAPID MOTOR TRANSPORT | | | SCAC4 |
| 73 | RPDO | RECUPERADORA DE METALES RIO BRAVO S | | | SCAC4 |
| 74 | RPDP | RAPID INDUSTRIAL PLASTICS CO INC | | | SCAC3 |
| 75 | RPDQ | RAPID SERVICE | | | SCAC3 |
| 76 | RPDR | RAPID TRANSIT INC | | | SCAC3 |
| 77 | RPDR | RAPID TRANSPORTATION INC | | | SCAC4 |
| 78 | RPDS | RAPIDOS SABINAS SA DE CV | | | SCAC4 |
| 79 | RPDT | RAPID TRANSIT COMPANY | | | SCAC3 |
| 80 | RPDV | RAPID DELIVERY USA | | | SCAC4 |
| 81 | RPDW | RAPID WEST INC | | | SCAC3 |
| 82 | RPDX | ROCKFORD PARK DISTRICT | | | PWRC |
| 83 | RPDY | RAYS PICKUP AND DELIVERY SERVICE | | | SCAC3 |
| 84 | RPE | RP Eisenbahn GmbH | Wachenheim (RP = Rheinland-Pfalz) | D | privat-bahn.de |
| 85 | RPE | RP Eisenbahn | | DE | VKM |
| 86 | RPEA | RP EXPRESS | | | SCAC4 |
| 87 | RPEC | REFRIESPESCIALIZADOS | | | SCAC4 |
| 88 | RPEE | R & P TRUCKING LLC | | | SCAC4 |
| 89 | RPEI | ROBICHAUD, PAUL E INC | | | SCAC3 |
| 90 | RPEI | ROBICHAUD, PAUL E INC | | | SCAC4 |
| 91 | RPEM | ROGERS PETROLEUM INC | | | SCAC4 |
| 92 | RPEN | ROYAL PACIFIC EXPRESS INC | | | SCAC3 |
| 93 | RPEP | RAPID EXPRESS DELIVERY & MESSENGER | | | SCAC3 |
| 94 | RPES | RAPID EXPRESS SERVICE INCORPORATED | | | SCAC3 |
| 95 | RPET | RPE TRANSPORTATION SERVICES | | | SCAC4 |
| 96 | RPEY | RIVERDALE POULTRY EXPRESS | | | SCAC4 |
| 97 | RPFC | ROYAL PACIFIC TRANSPORTATION LLC | | | SCAC4 |
| 98 | RPFE | RAPID FREIGHT EXPRESS INC | | | SCAC3 |
| 99 | RPFM | RAINBOW PIANO & FURNITURE MOVER INC | | | SCAC3 |
| 100 | RPFO | R P F OIL COMPANY | | | SCAC4 |
