| 1 | OREX | Oregon Dept. of Agriculture | 1/1994-7/2005 (not listed) | | NAKINA |
| 2 | OREX | REA Express, Inc. | added 10/1970; added 1/1971; eliminated 4/1974 | | NAKINA |
| 3 | OREX | REA Express, owned and operated by Railway Express Agency, Inc. | eliminated 1/1971 | | NAKINA |
| 4 | OREX | REA Express | added 10/1970 | | NAKINA |
| 5 | OREX | Omaha Refining Co. | 8/1920 | | NAKINA |
| 6 | OREX | REA Express | added 10/70; eliminated 4/74 | | NRHS |
| 7 | OREX | Oregon Dept. of Agriculture | 1/94-7/2000 | | NRHS |
| 8 | OREX | *OMAHA REFINING CO. | | | PWRC |
| 9 | OREX | *REA EXPRESS, INC. (RAILWAY EXPRESS AGENCY, INC.) | | | PWRC |
| 10 | OREX | +OREGON DEPARTMENT OF AGRICULTURE | | | PWRC |
| 11 | OREX | Oregon Department of Agriculture | | | RSRV |
| 12 | OREX | OREGON DEPARTMENT OF AGRICULTURE | | | SCAC4 |
