| 1 | CMC | Chemech Aviation (Pvt) Ltd. | | PK | AVCODES |
| 2 | CMC | CMC Electronics, Inc. | Callsign: Esterline, | CDN | AVCODES |
| 3 | CMC | CMC R.R., Inc. | 7/2000-7/2005 | | NAKINA |
| 4 | CMC | CMC R.R., Inc. | Jul-00 | | NRHS |
| 5 | CMC | CMC RAILROAD INC | | | PWRC |
| 6 | CMC | CMC Railroad | | | RSRV |
| 7 | CMC | CMC RAILROAD INC | | | SCAC4 |
| 8 | CMC | CMC Railroad Inc. | | USA | TRAFFIC |
| 9 | CMC | Českomoravský cement, a.s., nástupnická společnost | | CZ | VKM |
| 10 | CMCA | COMMERCIAL CARTAGE INC | | | SCAC3 |
| 11 | CMCA | CANAME | | | SCAC4 |
| 12 | CMCB | COMMUNITY CAB COMPANY | | | SCAC3 |
| 13 | CMCD | COMMERCE CONSOLIDATORS CORP | | | SCAC3 |
| 14 | CMCD | CAMIONNAGE M C D K INC | | | SCAC4 |
| 15 | CMCE | COMMERCIAL CARTAGE CO | | | SCAC3 |
| 16 | CMCF | COMMERCIAL CARTAGE INC | | | SCAC3 |
| 17 | CMCF | COMMERCIAL CARTAGE INC | | | SCAC4 |
| 18 | CMCH | COMMUNITY COACH INC | | | SCAC3 |
| 19 | CMCH | CAMACHO, RAUL LEON | | | SCAC4 |
| 20 | CMCI | COLONIAL METALS CO | | | SCAC3 |
| 21 | CMCI | CAPITAL MARINE CO INC | | | SCAC4 |
| 22 | CMCJ | CAMELOT COURIER LTD, THE | | | SCAC3 |
| 23 | CMCJ | CAMPBELL, C J & SON TRUCKING | | | SCAC4 |
| 24 | CMCK | C M C TRANSPORT INC | | | SCAC3 |
| 25 | CMCL | COMMODORE CRUISE LINE | | | SCAC3 |
| 26 | CMCL | CUSTOM CARRIERS LLC | | | SCAC4 |
| 27 | CMCN | C & M CARTAGE INC | | | SCAC3 |
| 28 | CMCO | CAMPBELL MOVING CO INC | | | SCAC3 |
| 29 | CMCQ | CHEMICAL CARRIER CORP | | | SCAC3 |
| 30 | CMCQ | COMMUNITY COACH INC | | | SCAC4 |
| 31 | CMCR | CARMAC TRANSPORT, INC | | | SCAC3 |
| 32 | CMCR | CAMCO RECYCLING INC | | | SCAC4 |
| 33 | CMCS | COMMERCIAL SERVICES, INC | | | SCAC3 |
| 34 | CMCT | CLOSET MAID NORTH | | | SCAC4 |
| 35 | CMCU | CROWLEY LINER SERVICES INC | | USA | BIC |
| 36 | CMCU | CROWLEY AMERICAN TRANSPORT, INC. | | | PWRC |
| 37 | CMCU | Crowley Maritime Corporation | | | RSRV |
| 38 | CMCU | CROWLEY MARITIME CORPORATION | | | SCAC3 |
| 39 | CMCU | CROWLEY MARITIME CORPORATION | | | SCAC4 |
| 40 | CMCW | COMPASS MARINE CORP | | | SCAC3 |
| 41 | CMCX | Sweetman Construction Co. | added 7/1991; 1/1994-7/2005 | | NAKINA |
| 42 | CMCX | Climax Molybdenum Co. | 4/1938-1/1943 (not listed) | | NAKINA |
| 43 | CMCX | J.J. Clifford | 1/1950 | | NAKINA |
| 44 | CMCX | Chem-Met Corp. | added 4/1960; 4/1961; eliminated 7/1964 | | NAKINA |
| 45 | CMCX | Chem-Met Corp. | 4/61; eliminated 7/64 | | NRHS |
| 46 | CMCX | Sweetman Construction Co. | added 7/91; 1/94-7/2000 | | NRHS |
| 47 | CMCX | *CLIMAX MOLYBDENUM CO. | | | PWRC |
| 48 | CMCX | *J. J. CLIFFORD | | | PWRC |
| 49 | CMCX | *CHEM-MET CORP. | | | PWRC |
| 50 | CMCX | *CMC RAILROAD INC | | | PWRC |
| 51 | CMCX | +SWEETMAN CONSTRUCTION COMPANY | | | PWRC |
| 52 | CMCX | CMC Railroad (Sweetman Construction) | | | RSRV |
| 53 | CMCX | SWEETMA | | | SCAC4 |
| 54 | CMCX | Cuban Molasses Co. | | USA | TRAFFIC |
| 55 | CMCY | CARR MOVING COMPANY | | | SCAC3 |
| 56 | CMCY | CORBITT MANUFACTURING COMPANY INC | | | SCAC4 |
| 57 | CMCZ | *CARTER MINIMG CO. | | | PWRC |
| 58 | CMCZ | *CROWLEY MARITIME CORP. | | | PWRC |
| 59 | CMCZ | Crowley Maritime Corporation | | | RSRV |
| 60 | CMCZ | CROWLEY MARITIME CORP. | | | SCAC4 |
| 61 | CMCZ | CMC ZAWIERCIE S.A | | PL | VKM |
