| 1 | CKIA | CORK, IVAN | | | SCAC4 |
| 2 | CKIB | COOK INLET TUG & BARGE CO INC | | | SCAC3 |
| 3 | CKIB | COOK INLET TUG & BARGE CO INC | | | SCAC4 |
| 4 | CKIC | CARTER TRUCKING COMPANY | | | SCAC3 |
| 5 | CKIC | CROUCH TRUCKING INC | | | SCAC4 |
| 6 | CKID | CLARKE INTERMODEL | | | SCAC4 |
| 7 | CKIE | CIRCLE KB INDUSTRIES | | | SCAC4 |
| 8 | CKIG | CARR, DON TRUCKING | | | SCAC3 |
| 9 | CKIG | COLT TRUCKING | | | SCAC4 |
| 10 | CKIL | COTA TRUCKING | | | SCAC3 |
| 11 | CKIN | Chesapeake and Indiana R.R. Co., Inc. | added 10/2004; 7/2005; eliminated 4/2006 | | NAKINA |
| 12 | CKIN | CHESAPEAKE & INDIANA RAILROAD CO., INC. | | | PWRC |
| 13 | CKIN | Chesapeake and Indiana Railroad | | | RSRV |
| 14 | CKIN | COOK INLET PIPE LINE COMPANY | | | SCAC3 |
| 15 | CKIN | CHESAPEAKE AND INDIANA RAILROAD COM | | | SCAC4 |
| 16 | CKIR | COOK INTERSTATE TRANSPORTATION INC | | | SCAC3 |
| 17 | CKIS | C & S TRUCKING INC | | | SCAC4 |
| 18 | CKIT | CALKINS TRUCKING INC | | | SCAC3 |
| 19 | CKIT | CALKINS TRANSPORTATION INC | | | SCAC4 |
| 20 | CKIX | C.K. Industries, Inc. | added 10/2000; 7/2005 | | NAKINA |
| 21 | CKIX | Cook Industries, Inc. | added 7/1975; eliminated 4/1978 | | NAKINA |
| 22 | CKIX | Cook Industries, Inc. | added 7/75; eliminated 4/78 | | NRHS |
| 23 | CKIX | C.K. Industries, Inc. | added 10/2000 | | NRHS |
| 24 | CKIX | *COOK INDUSTRIES, INC. | | | PWRC |
| 25 | CKIX | +C. K. INDUSTRIES, INC. | | | PWRC |
| 26 | CKIX | C.K. Industries | | | RSRV |
| 27 | CKIX | CK INDUSTRIES INC | | | SCAC4 |
