| 10501 | CMSK | COMSTOCK TRUCKING INC | | | SCAC3 |
| 10502 | CMSL | Cape May Seashore Lines | 7/2005 | | NAKINA |
| 10503 | CMSL | CAPE MAY SEASHORE LINES | | | PWRC |
| 10504 | CMSL | CHEM-SECURITY LTD | | | SCAC3 |
| 10505 | CMSL | CAPE MAY SEASHORE LINES | | | SCAC4 |
| 10506 | CMSL | Cape May Seashore Lines | | USA | TRAFFIC |
| 10507 | CMSM | COMMAND SYSTEMS INC | | | SCAC3 |
| 10508 | CMSM | COMMA | | | SCAC4 |
| 10509 | CMSN | Crowley Marine Services | 7/2000-7/2005 | | NAKINA |
| 10510 | CMSN | Crowley Marine Services | Jul-00 | | NRHS |
| 10511 | CMSN | CROWLEY MARINE SERVICES | | | PWRC |
| 10512 | CMSN | Crowley Marine Services | | | RSRV |
| 10513 | CMSN | CROWLEY MARINE TRANSPORT | | | SCAC3 |
| 10514 | CMSN | CROWLEY MARINE SERVICES INC | | | SCAC4 |
| 10515 | CMSO | CHAMBLEE MOVING & STORAGE | | | SCAC3 |
| 10516 | CMSO | CAPITOL MOVING & STORAGE INC | | | SCAC4 |
| 10517 | CMSP | CAPITAL MESSENGER SERVICE INC | | | SCAC3 |
| 10518 | CMSQ | CALIFORNIA MESSENGER SERVICE | | | SCAC3 |
| 10519 | CMSR | CHARTER MOVING AND STORAGE CO INC | | | SCAC3 |
| 10520 | CMSS | C & M SALES & SERVICES | | | SCAC3 |
| 10521 | CMST | CMS TRUCKING INC | | | SCAC3 |
| 10522 | CMST | Central Scottish Motor Traction | | GB | TRAFFIC |
| 10523 | CMSTP | Chicage Milwaukee St.Paul & Pacific | | USA | TRAFFIC |
| 10524 | CMSU | CAMEROON SHIPPING LINES S A | | | SCAC3 |
| 10525 | CMSV | CRC MARINE SEVICES | | | SCAC3 |
| 10526 | CMSV | CRC MARINE SERVICES | | | SCAC4 |
| 10527 | CMSW | CHESTNUT MOVING & STORAGE | | | SCAC3 |
| 10528 | CMSW | CRIMSON SHIPPING CO INC | | | SCAC4 |
| 10529 | CMSX | Union Tank Car Co. | added 7/1968; 4/1970; eliminated 4/1970 | | NAKINA |
| 10530 | CMSX | Cominco Ltd. | added 10/1966; 10/1966; eliminated 7/1968 | | NAKINA |
| 10531 | CMSX | The Consolidated Mining and Smelting Company of Canada, Ltd. | 7/1935-7/1965; eliminated 10/1966 | | NAKINA |
| 10532 | CMSX | The Consolidated Mining and Smelting Company of Canada, Ltd. | 4/38-7/65; eliminated 10/66 | | NRHS |
| 10533 | CMSX | Cominco Ltd. | added 10/66; 10/66; eliminated 7/68 | | NRHS |
| 10534 | CMSX | Union Tank Car Co. | added 7/68; 4/70; eliminated 4/70 | | NRHS |
| 10535 | CMSX | *COMINCO, LTD. (UNION TANK CAR CO.)[CONSOLIDATED MINING & SMELTING CO. OF CANADA LTD.] | | | PWRC |
| 10536 | CMSX | *CAPE MAY SEASHORE LINES, INC. | | | PWRC |
| 10537 | CMSX | +CEDAR MOUNTAIN STONE CORP. | | | PWRC |
| 10538 | CMSX | CEDAR MOUNTAIN STONE CORPORATION | | | SCAC4 |
| 10539 | CMSY | COMTRANS SYSTEMS INC | | | SCAC3 |
| 10540 | CMSY | CLASSIFIER MILLING SYSTEMS CORPORAT | | | SCAC4 |
| 10541 | CMT | Casement Aviation | Callsign: Casement, | USA | AVCODES |
| 10542 | CMT | Casement Aviation | | | ICAO1 |
| 10543 | CMT | CHICAGO MASS TRANSIT | | | PWRC |
| 10544 | CMTA | CALUMET MARINE TRANSPORTATION INC, | | | SCAC3 |
| 10545 | CMTA | CAMERON TRAINING CENTRE | | | SCAC4 |
| 10546 | CMTB | COMMERCIAL TRANSFER SYSTEMS INC | | | SCAC3 |
| 10547 | CMTC | CAPITOL MOTOR TRANSPORTATION CO, IN | | | SCAC3 |
| 10548 | CMTD | COMET MESSENGER AND DELIVERY SERVIC | | | SCAC3 |
| 10549 | CMTE | CREST MOLD TECHNOLGOY INC | | | SCAC4 |
| 10550 | CMTI | CONSTRUCTION MATERIALS TRUCKING INC | | | SCAC3 |
| 10551 | CMTI | COMETTI EXPRESS LLC | | | SCAC4 |
| 10552 | CMTK | CRUM TRUCKING INC | | | SCAC4 |
| 10553 | CMTL | CAN-AM MARINE TRANSIT LTD | | | SCAC3 |
| 10554 | CMTN | CATSKILL MOUNTAIN RAILROAD | | | PWRC |
| 10555 | CMTO | CEMENT TRANSPORT CO | | | SCAC3 |
| 10556 | CMTO | CROATIA MACHINE TOOL OF CANADA LTD | | | SCAC4 |
| 10557 | CMTP | Metropolitan Public Transport Company | City: Teresina | BR | TRAFFIC |
| 10558 | CMTQ | COMMERCIAL TRUCKING CO | | | SCAC3 |
| 10559 | CMTQ | CAMPOS TRUCKING | | | SCAC4 |
| 10560 | CMTR | CARPENTER'S MOTOR TRANSPORT, INC | | | SCAC3 |
| 10561 | CMTT | CMS TWO (2) TRUCKING INC | | | SCAC4 |
| 10562 | CMTU | IJ-CONTAINER APS | | DK | BIC |
| 10563 | CMTU | CMS CONTAINER SERVICES, INC. | | | SCAC3 |
| 10564 | CMTU | IJ-CONTAINER APS | | | SCAC4 |
| 10565 | CMTV | C M T | | | SCAC3 |
| 10566 | CMTV | CMT TRANSPORTATION LLC | | | SCAC4 |
| 10567 | CMTW | C & M TRUCKING INC OF WANATAH | | | SCAC3 |
| 10568 | CMTW | COLUMBIA MACHINE TOOL OF WINDSOR IN | | | SCAC4 |
| 10569 | CMTX | Compass Capital Corp. | added 4/2006 | | NAKINA |
| 10570 | CMTX | N.I.K. Non-Stock Marketing Cooperative | added 1/1991; eliminated 1/1993; 1/1994 (not listed) | | NAKINA |
| 10571 | CMTX | John E. Shatford, Agent | 7/1935-4/1947 | | NAKINA |
| 10572 | CMTX | John E. Shatford, Agent | Apr-38 | | NRHS |
| 10573 | CMTX | N.I.K. Non-Stock Marketing Cooperative | added 1/91; eliminated 1/93; 1/94 | | NRHS |
| 10574 | CMTX | *JOHN E. SHATFORD, AGENT | | | PWRC |
| 10575 | CMTX | *N.I.K. NON-STOCK MARKETING COOPERATIVE | | | PWRC |
| 10576 | CMTX | +COMPASS CAPITAL CORP. | | | PWRC |
| 10577 | CMTX | COMPASS CAPITAL CORPORATION | | | SCAC4 |
| 10578 | CMTY | COMMUNITY & JOHNSON CORPORATION | | | SCAC3 |
| 10579 | CMTY | Herzog Transit Services | City: Austin | USA | TRAFFIC |
| 10580 | CMU | Northern Aviation Service Co. Ltd. | Callsign: Lanna Air, | T | AVCODES |
| 10581 | CMU | Northern Aviation Service | | | ICAO1 |
| 10582 | CMU | COLUMBUS CHARTER SERVICE | | | PWRC |
| 10583 | CMU | Columbus Charter Service | | | RSRV |
| 10584 | CMUA | CASTRO MACIAS, MIGUEL ANGEL | | | SCAC4 |
| 10585 | CMUB | CLASSIC LIMOUSINE INC | | | SCAC3 |
| 10586 | CMUC | CARLYLE MANUFACTURING CO INC | | | SCAC3 |
| 10587 | CMUF | CONSOLIDATED MANUFACTURERS | | | SCAC3 |
| 10588 | CMUG | C & M AUTO TRANSPORT | | | SCAC3 |
| 10589 | CMUG | CM TRUCKING | | | SCAC4 |
| 10590 | CMUH | C & M TRUCKING | | | SCAC3 |
| 10591 | CMUI | COMMERCIAL SOURCE INC | | | SCAC3 |
| 10592 | CMUI | C & M HAULERS INC | | | SCAC4 |
| 10593 | CMUJ | CUNNINGHAM MOVING & STORAGE | | | SCAC4 |
| 10594 | CMUK | COTTOMS TRUCKING | | | SCAC3 |
| 10595 | CMUK | CMM TRUCKING INC | | | SCAC4 |
| 10596 | CMUL | CMC TRUCK LINE | | | SCAC3 |
| 10597 | CMUM | COMMUTER TRANSPORTATION | | | SCAC3 |
| 10598 | CMUN | C M T TRUCKING | | | SCAC3 |
| 10599 | CMUO | C & M TOURS | | | SCAC3 |
| 10600 | CMUP | CHEMET MARITIME PTE LTD. | | | SCAC3 |
