| 1 | SRP | Bereitschaftpolizei Rheinland-Pfalz | Callsign: Sperber, | D | AVCODES |
| 2 | SRP | Polizeihubschrafterstaffel Rheinland-Pfalz | | | ICAO1 |
| 3 | SRP | Scandic Rail Partners ApS | 2006 - | DK | jernbanen.dk |
| 4 | SRP | SALT RIVER PROJECT | | | PWRC |
| 5 | SRP | Safe Handling Rail | | | RSRV |
| 6 | SRP | Scandic Rail Partners ApS | 2006 - | DK | TRAFFIC |
| 7 | SRPA | SERVICIO PUBLICO FEDERAL | | | SCAC4 |
| 8 | SRPB | SHARP LOGISTICS INC | | | SCAC4 |
| 9 | SRPC | SIERRA PACIFIC EXPRESS | | | SCAC4 |
| 10 | SRPH | SMITH, RALPH COMPANY | | | SCAC4 |
| 11 | SRPJ | SOUTHERN ARC TRANSPORTATION LLC | | | SCAC4 |
| 12 | SRPK | SHARP EXPRESS | | | SCAC4 |
| 13 | SRPQ | STAR TRANSPORT | | | SCAC4 |
| 14 | SRPS | Scottish Railway Preservation Society | | UK | VKM |
| 15 | SRPT | STARK PROPERTIES | | | SCAC4 |
| 16 | SRPU | SARP INTERMODAL HIZMETLERI AS | | TR | BIC |
| 17 | SRPV | SHARP TRANSIT | | | SCAC4 |
| 18 | SRPW | SHARPLESS, M TRUCKING | | | SCAC4 |
| 19 | SRPX | Rhinelander Division, St. Regis Paper Co. | added 1/1968; 4/1970-1/1975 | | NAKINA |
| 20 | SRPX | Salt River Project Agricultural Improvement and Power District | added 7/1978; 1/1980; eliminated 10/1989; 1/1994-7/2005 (not listed) | | NAKINA |
| 21 | SRPX | Rhinelander Division, St. Regis Paper Co. | added 1/68; 4/70-1/75 | | NRHS |
| 22 | SRPX | Salt River Project Agricultural Improvement and Power District | added 7/78; 1/80; eliminated 10/89; 1/94-7/2000 | | NRHS |
| 23 | SRPX | *RHINELANDER DIV., ST. REGIS PAPER CO. | | | PWRC |
| 24 | SRPX | *SALT RIVER PROJECT, AGRICULTURAL IMPROVEMENT & POWER DISTRICT | | | PWRC |
| 25 | SRPX | Salt River Project Agricultural Improvement and Power District | | | RSRV |
| 26 | SRPX | SALT RIVER PROJECT, AGRI.IMPRVMT & | | | SCAC4 |
| 27 | SRPY | STARS & STRIPES TRANSPORT | | | SCAC4 |
| 28 | SRPZ | SAVANNAH RIVER PLANT | | | PWRC |
