| 1 | RPC | Aerolineas Del Pacifico | | | ICAO1 |
| 2 | RPCC | RUPP CONTRACTING CORPORATION | | | SCAC3 |
| 3 | RPCC | ROCKPORT CARRIER COMPANY INC | | | SCAC4 |
| 4 | RPCD | RAPID CITY DELIVERY | | | SCAC3 |
| 5 | RPCD | REMPEL, KEITH E | | | SCAC4 |
| 6 | RPCI | ROCKY PACIFIC SHIPPING INC | | | SCAC3 |
| 7 | RPCI | RPK TRANSPORT INC | | | SCAC4 |
| 8 | RPCL | RPC | | | SCAC4 |
| 9 | RPCN | RAPID CARTAGE INC | | | SCAC3 |
| 10 | RPCO | RAPCO DISTRIBUTING COMPANY | | | SCAC3 |
| 11 | RPCP | RING POWER CORPORATION | | | SCAC4 |
| 12 | RPCU | TIC PETERSBURG LTD | | | SCAC4 |
| 13 | RPCV | R PERSONAL COURIER SERVICE | | | SCAC3 |
| 14 | RPCX | Railroad Passenger Car Numbering Bureau Inc. | 7/2005 (not listed) | | NAKINA |
| 15 | RPCX | Robeson Process Co. | 8/1920-10/1966; eliminated 10/1969 | | NAKINA |
| 16 | RPCX | Ralston Purina Co. | added 1/1974; 1/1975-1/1980; eliminated 7/1989 | | NAKINA |
| 17 | RPCX | Robeson Process Co. | 4/38-10/66; eliminated 10/69 | | NRHS |
| 18 | RPCX | Ralston Purina Co. | added 1/74; 1/75-1/80; eliminated 7/89 | | NRHS |
| 19 | RPCX | *ROBESON PROCESS CO. | | | PWRC |
| 20 | RPCX | *RALSTON PURINA CO. | | | PWRC |
| 21 | RPCX | +RAILROAD PASSENGER CAR NUMBERING BUREAU, INC. | | | PWRC |
| 22 | RPCX | Railroad Passenger Car Numbering Bureau | | | RSRV |
| 23 | RPCX | RAILROAD PASSENGER CAR NUMBERING BU | | | SCAC4 |
| 24 | RPCX | Ralston Purina Co. | | USA | TRAFFIC |
| 25 | RPCZ | RALSTON PROTEIN CO, | | | PWRC |
