| 1 | JCO | Concierge U Limited t/a Jet Concierge Club Ltd | Callsign: Concierge, | GB | AVCODES |
| 2 | JCOC | JACKSON COUNTY OIL CO INC | | | SCAC4 |
| 3 | JCOL | JACK COLE COMPANY | | | PWRC |
| 4 | JCOM | JOELSCARZ.COM | | | SCAC4 |
| 5 | JCOP | JASMIN CORP | | | SCAC4 |
| 6 | JCOR | JADCORE TRUCKING INC | | | SCAC4 |
| 7 | JCOS | JC TOURS INC | | | SCAC4 |
| 8 | JCOT | JC ON THE MOVE INC | | | SCAC4 |
| 9 | JCOX | Jordan Co. | 4/1947 (not listed); 1/1950-4/1970; eliminated 4/1971 | | NAKINA |
| 10 | JCOX | Jordan Co. | 1/52-4/70; eliminated 4/71 | | NRHS |
| 11 | JCOX | JORDAN CO. | | | PWRC |
