| 10401 | CMPX | Compass Capital Corp. | added 7/2005; 7/2005 | | NAKINA |
| 10402 | CMPX | Chemical Products Corp. | 7/1935-10/1957; eliminated 4/1961 | | NAKINA |
| 10403 | CMPX | Chemical Products Corp. | 4/38-10/57; eliminated 4/61 | | NRHS |
| 10404 | CMPX | *CHEMICAL PRODUCTS CORP. | | | PWRC |
| 10405 | CMPX | +COMPASS CAPITAL CORP. | | | PWRC |
| 10406 | CMPX | COMPASS CAPITAL CORPORATION | | | SCAC4 |
| 10407 | CMPY | CAMPYS EPXRESS | | | SCAC3 |
| 10408 | CMPY | CAMPYS EXPRESS | | | SCAC4 |
| 10409 | CMQ | Central Maine and Quebec Railway | | | RSRV |
| 10410 | CMQ | Central Maine and Quebec Railwa | | CDN | TRAFFIC |
| 10411 | CMQA | CHARTER MASTER CO | | | SCAC3 |
| 10412 | CMQB | CHAMCO TRANSPORT INC | | | SCAC3 |
| 10413 | CMQC | CONSTRUCTION AND MARINE EQUIPMENT C | | | SCAC4 |
| 10414 | CMQE | CIRCLE M ENTERPRISES | | | SCAC3 |
| 10415 | CMQF | COMMERCIAL FREIGHT SYSTEM INC. | | | SCAC3 |
| 10416 | CMQG | COLLINS MOVING & STG CO | | | SCAC3 |
| 10417 | CMQG | C & M CARTAGE | | | SCAC4 |
| 10418 | CMQH | C & M SHUTTLE INC | | | SCAC3 |
| 10419 | CMQH | CRIPE MOBILE HOME TRANSPORT LLC | | | SCAC4 |
| 10420 | CMQI | CAMELI & CO SRL | | | SCAC3 |
| 10421 | CMQJ | C & M TRANSPORTATION & LEASING CO | | | SCAC3 |
| 10422 | CMQJ | CMS LOGISITICS INC | | | SCAC4 |
| 10423 | CMQK | CRIMSON KING SHIPPING COMPANY | | | SCAC3 |
| 10424 | CMQL | COMPASS LIMOUSINE | | | SCAC3 |
| 10425 | CMQN | CEMCO INC | | | SCAC3 |
| 10426 | CMQN | CINECAM CAMERA INC | | | SCAC4 |
| 10427 | CMQO | C & M TRANSPORT | | | SCAC3 |
| 10428 | CMQP | CONSOLIDATED MACHINE & EQUIPMENT CO | | | SCAC3 |
| 10429 | CMQQ | CMG EQUIPMENT SUPPLY | | | SCAC3 |
| 10430 | CMQR | CONTROLLED MATERIALS AND EQUIPMENT | | | SCAC3 |
| 10431 | CMQS | CAREFUL MOVING & STORAGE INC | | | SCAC3 |
| 10432 | CMQS | COMAQSA | | | SCAC4 |
| 10433 | CMQT | COSMOPOLITAN TRUCKING CORPORATION | | | SCAC3 |
| 10434 | CMQT | CMA LOGISTICS INC | | | SCAC4 |
| 10435 | CMQV | COLLINS MOVING SERVICE INC | | | SCAC3 |
| 10436 | CMQV | CMA SERVICES INC | | | SCAC4 |
| 10437 | CMQW | CLASSIC MOVING & STORAGE INC | | | SCAC4 |
| 10438 | CMQY | COMMERCIA | | | SCAC4 |
| 10439 | CMR | Cam Air Management Ltd. | Callsign: Cameo, | GB | AVCODES |
| 10440 | CMR | CAM Air Management | | | ICAO1 |
| 10441 | CMR | Central Midland Ry. Co. | 7/2005 (not listed); added 10/2007 | | NAKINA |
| 10442 | CMR | CENTRAL MIDLAND RWY. CO. | | | PWRC |
| 10443 | CMR | Central Midland Railway | | | RSRV |
| 10444 | CMR | CENTRAL MIDLAND RAILWAY COMPANY | | | SCAC4 |
| 10445 | CMRB | CUMMINGS, ROBERT A | | | SCAC3 |
| 10446 | CMRC | COLUMBIA RECYCLE 1996 LTD | | | SCAC4 |
| 10447 | CMRD | CHICAGO-MILWAUKEE RUSH DELIVERY INC | | | SCAC3 |
| 10448 | CMRD | CANCHOLA MARTINEZ, DAVID | | | SCAC4 |
| 10449 | CMRE | CARLINES MARING TOWING INC | | | SCAC3 |
| 10450 | CMRE | CENTRE MARAICHER EUGENE GUINOIS JR | | | SCAC4 |
| 10451 | CMRG | CAMS TRUCKING | | | SCAC3 |
| 10452 | CMRG | CRUCES MARGUEL | | | SCAC4 |
| 10453 | CMRH | COMMERCIAL HAULING CO INC | | | SCAC3 |
| 10454 | CMRH | CROWN MARINE MANAGEMENT S A OF MARS | | | SCAC4 |
| 10455 | CMRI | CONTAINER MASTER INC | | | SCAC3 |
| 10456 | CMRI | CARGO MARITIME INC | | | SCAC4 |
| 10457 | CMRJ | CAMROSE COACH LINES LTD | | | SCAC3 |
| 10458 | CMRK | CAMAR LIMITED | | | SCAC4 |
| 10459 | CMRL | COMMERCIAL TRANSPORTATION INC | | | SCAC3 |
| 10460 | CMRM | COMPUTER MOVERS INC | | | SCAC3 |
| 10461 | CMRN | CAMERON FREIGHT LINE INC | | | SCAC3 |
| 10462 | CMRO | COMMERCE TRANSPORTATION CO | | | SCAC3 |
| 10463 | CMRP | CMR PARCEL SERVICE INC | | | SCAC3 |
| 10464 | CMRQ | CENTRAL MANOR CARTAGE | | | SCAC3 |
| 10465 | CMRQ | CAMEO CARDS | | | SCAC4 |
| 10466 | CMRR | CATSKILL MOUNTAIN RAILROAD | | | PWRC |
| 10467 | CMRR | COMSTOCK MOUNTAIN LION RAILROAD | | | SCAC4 |
| 10468 | CMRS | CMS TRUCKING CO | | | SCAC3 |
| 10469 | CMRT | CAMRETT LOGISTICS INC | | | SCAC4 |
| 10470 | CMRU | AIR LIQUIDE CAMOA | | | SCAC4 |
| 10471 | CMRV | COMPANIA MARITIMA VILLA NOVA S A , | | | SCAC3 |
| 10472 | CMRW | CHEESEMAN, ROBERT W INC | | | SCAC3 |
| 10473 | CMRW | CANADIAN MR SWEEPER INC | | | SCAC4 |
| 10474 | CMRX | Cimarron Gas Companies Inc. | added 10/1993; 1/1994; eliminated 1/1996 | | NAKINA |
| 10475 | CMRX | Chicago Macaroni Co. | 7/1935 | | NAKINA |
| 10476 | CMRX | Cimarron Gas Liquids Co. | added 10/1988; eliminated 10/1993 | | NAKINA |
| 10477 | CMRX | Cudahy's Milwaukee Refrigerator Line | 8/1920 | | NAKINA |
| 10478 | CMRX | Cimarron Gas Liquids Co. | added 10/88; eliminated 10/93 | | NRHS |
| 10479 | CMRX | Cimarron Gas Companies Inc. | added 10/93; 1/94; eliminated 1/96 | | NRHS |
| 10480 | CMRX | *CUDAHY'S MILWAUKEE REFRIGERATOR LINE | | | PWRC |
| 10481 | CMRX | *CIMARRON GAS COMPANIES INC. | | | PWRC |
| 10482 | CMRX | COOPERSVILLE & MARNE RAILROAD | | | PWRC |
| 10483 | CMS | Commercial Aviation | Callsign: Access, | CDN | AVCODES |
| 10484 | CMS | CAMEX Airlines LLC | IATA: Z7, Callsign: Camex, IATA Prefix: 207, | GE | AVCODES |
| 10485 | CMS | Commercial Aviation | | | ICAO1 |
| 10486 | CMS | CAMIONETAS MONREAL | | | SCAC4 |
| 10487 | CMSA | COMMERCI | | | SCAC4 |
| 10488 | CMSB | CMS TRUCKING COMPANY INC | | | SCAC3 |
| 10489 | CMSC | CRONE MOVING & STORAGE COMPANY, INC | | | SCAC3 |
| 10490 | CMSC | C & M SERVICES COMPANY LLC | | | SCAC4 |
| 10491 | CMSD | COMET SHIPPING A S DENMARK | | | SCAC3 |
| 10492 | CMSD | CHISHOLM MACHINERY SALES LIMITED | | | SCAC4 |
| 10493 | CMSE | CONTINENTAL MOVING SERVICES | | | SCAC3 |
| 10494 | CMSE | C M S CORP | | | SCAC4 |
| 10495 | CMSF | C M S SERVICES INC | | | SCAC3 |
| 10496 | CMSG | CAROLINA MOVING & STORAGE CO INC | | | SCAC3 |
| 10497 | CMSH | C & M TRANSPORTATION SYSTEMS INC | | | SCAC3 |
| 10498 | CMSI | CORD MOVING & STORAGE CO | | | SCAC3 |
| 10499 | CMSI | CORD MOVING AND STORAGE | | | SCAC4 |
| 10500 | CMSJ | CARE MOVING & STORAGE COMPANY | | | SCAC3 |
