| 601 | CALX | The Calco Chemical Co., Inc. | Apr-38 | | NRHS |
| 602 | CALX | Calco Chemical Division, American Cyanamid Co. | 1/52; eliminated 10/53 | | NRHS |
| 603 | CALX | American Cyanamid Co., Calco Chemical Division | added 10/53; eliminated 4/54 | | NRHS |
| 604 | CALX | American Cyanamid Co. | added 4/54 | | NRHS |
| 605 | CALX | Calhoun Trading Co., Inc. | added 10/74; 1/75; eliminated 7/76 | | NRHS |
| 606 | CALX | California Railcar Corp. | added 7/79; 1/80-7/2000 | | NRHS |
| 607 | CALX | *AMERICAN CYANAMID, CALCO CHEMICAL DIV. | | | PWRC |
| 608 | CALX | *CADDO, ANTONINE & LITTLE MISSOURI | | | PWRC |
| 609 | CALX | *CALHOUN TRADING CO. INC. | | | PWRC |
| 610 | CALX | +CALIFORNIA RAILCAR CORPORATION | | | PWRC |
| 611 | CALX | California Railcar Corporation | | | RSRV |
| 612 | CALX | CALIFORNIA RAILCAR CORPORATION | | | SCAC4 |
| 613 | CALX | California Railcar Corp. | | USA | TRAFFIC |
| 614 | CALY | CALEDONIA LINES INC | | | SCAC3 |
| 615 | CAM | Village Aviation Inc. d/b/a Camai Air | IATA: R9, Callsign: Air Camai, IATA Prefix: 451, Name changed from Camai Air | USA | AVCODES |
| 616 | CAM | Camai Air | IATA: R9, Callsign: Air Camai, IATA Prefix: 451, Name changed to Village Aviation Inc. d/b/a Camai Air | USA | AVCODES |
| 617 | CAM | Canadian Armed Forces | Callsign: Canadian Military, ICAO designator changed to CFC | CDN | AVCODES |
| 618 | CAM | Camai Air | IATA: R9 | | ICAO1 |
| 619 | CAM | CAMPUS COACH LINES | | | SCAC4 |
| 620 | CAM | Cogne - Acquefredde, mining rail | | I | TRAFFIC |
| 621 | CAMA | CAMACH | | | SCAC4 |
| 622 | CAMC | CAMP CURTIN TRANSFER, INC | | | SCAC3 |
| 623 | CAMC | CAMP CURTIN TRANSFER, INC | | | SCAC4 |
| 624 | CAMD | CAMPBELLS EXPRESS | | | SCAC3 |
| 625 | CAMD | COLEMAN AMERICAN MOVING SERVICES IN | | | SCAC4 |
| 626 | CAME | COLEMAN AMERICAN MOVING SERVICES IN | | | SCAC4 |
| 627 | CAMF | CANADIAN AERO MANUFACTURING | | | SCAC4 |
| 628 | CAMG | COLEMAN AMERICAN MOVING SERVICES IN | | | SCAC4 |
| 629 | CAMH | CAMPBELLS MOVING COMPANY, INC | | | SCAC3 |
| 630 | CAMH | CAMACHO PORTILLO, JUAN CARLOS | | | SCAC4 |
| 631 | CAMI | CAN AM | | | SCAC3 |
| 632 | CAMJ | CAMELOT COMPANY, THE | | | SCAC4 |
| 633 | CAMK | C A MOTOR TRANSPORT CO | | | SCAC3 |
| 634 | CAMK | CAN-AM RV CENTRE | | | SCAC4 |
| 635 | CAMN | CROWLEY AMERICAN TRANSPORT INC | | | SCAC3 |
| 636 | CAMN | CROWLEY LINER SERVICES INC | | | SCAC4 |
| 637 | CAMO | CAL-STATE MOVING & STG | | | SCAC3 |
| 638 | CAMO | CAMACHO, RICARDO | | | SCAC4 |
| 639 | CAMP | CAMPOS EXPRESS INC | | | SCAC3 |
| 640 | CAMPUS | Campus Coach | | USA | TRAFFIC |
| 641 | CAMQ | CAMPANELLA TRUCKING CORP | | | SCAC3 |
| 642 | CAMR | CO-AM TRANSPORT SERVICES INC | | | SCAC3 |
| 643 | CAMR | Cambrian Railways | | GB | TRAFFIC |
| 644 | CAMS | CAREY MOVING & STORAGE INC | | | SCAC3 |
| 645 | CAMT | CAMBEIS TRUCKING COMPANY, INC | | | SCAC3 |
| 646 | CAMT | CAM-SCOTT INTERNATIONAL INC | | | SCAC4 |
| 647 | CAMU | MGC PURE CHEMICALS AMERICA | | USA | BIC |
| 648 | CAMU | MGC Pure Chemicals America | | | RSRV |
| 649 | CAMV | CAMACH | | | SCAC4 |
| 650 | CAMW | CATCO | | | SCAC3 |
| 651 | CAMW | CALIFORNIA MIDWEST XPRESS INC | | | SCAC4 |
| 652 | CAMX | Chrysler Rail Transportation Corp. | added 1/1988; 1/1994 (not listed); eliminated 1/1997 | | NAKINA |
| 653 | CAMX | Chrysler Capital Transportation Services, Inc. | added 4/1987; eliminated 1/1988 | | NAKINA |
| 654 | CAMX | Canamax Commodity Corp. | added 10/1981; eliminated 1/1985 | | NAKINA |
| 655 | CAMX | Canamax Commodity Corp. | added 10/81; eliminated 1/85 | | NRHS |
| 656 | CAMX | Chrysler Capital Transportation Services, Inc. | added 4/87; eliminated 1/88 | | NRHS |
| 657 | CAMX | Chrysler Rail Transportation Corp. | added 1/88; 1/94; eliminated 1/97 | | NRHS |
| 658 | CAMX | *CANAMAX COMMODITY CORP. | | | PWRC |
| 659 | CAMX | *CHRYSLER RAIL TRANSPORTATION CORPORATION | | | PWRC |
| 660 | CAMX | Canamax Commodity Corporation | | | RSRV |
| 661 | CAMY | CARL MESSENGER SERVICE INC | | | SCAC3 |
| 662 | CAMY | CAM TRANSPORTATION SERVICES LLC | | | SCAC4 |
| 663 | CAN | Air Canarias, S. Coop Ltda | Callsign: Aircan, | E | AVCODES |
| 664 | CAN | Crest Aviation | Name changed to 3Grcomm Ltd t/a Crest Aviation | GB | AVCODES |
| 665 | CAN | 3Grcomm Ltd t/a Crest Aviation | Callsign: Crest, Name changed from Crest Aviation | GB | AVCODES |
| 666 | CAN | Contact Air Sarl | Callsign: Gober Air, | RN | AVCODES |
| 667 | CAN | Crest Aviation | | | ICAO1 |
| 668 | CAN | CARNIVAL BUS CO INC | | | SCAC4 |
| 669 | CAN | cantus Verkersgesellschaft mbH | | DE | VKM |
| 670 | CANA | CAN-AMERICAN PRODUCE TRUCKING, LTD | | | SCAC3 |
| 671 | CANA | CAN AMERICAN ENTERPRISES LTD | | | SCAC4 |
| 672 | CANC | CLARKE, A & CO LTD | | | SCAC3 |
| 673 | CANC | CANDS INC | | | SCAC4 |
| 674 | CANCL | Canada Coach Lines | | CDN | TRAFFIC |
| 675 | CAND | C&D TRANSPORTATION CO | | | SCAC3 |
| 676 | CANF | CANNON TRANSPORTING INC | | | SCAC3 |
| 677 | CANG | C & A TRANS | | | SCAC4 |
| 678 | CANH | CAN-AMERICA FREIGHT INC | | | SCAC3 |
| 679 | CANI | CANTLIN TRUCKING SERVICE | | | SCAC3 |
| 680 | CANJ | CAR TRANSPORTERS CORP | | | SCAC3 |
| 681 | CANK | CANNON TRUCKING | | | SCAC3 |
| 682 | CANL | CONTAINER-CARE INTERNATIONAL INC | | | SCAC3 |
| 683 | CANL | CANDELA SHIPPING COMPANY LIMITED | | | SCAC4 |
| 684 | CANM | CANADIAN MACHINERY MOVERS, LTD | | | SCAC3 |
| 685 | CANM | CANADIAN MACHINERY MOVERS LIMITED | | | SCAC4 |
| 686 | CANN | CANUSA TRANSPORT LTD | | | SCAC4 |
| 687 | CANO | CANNON MOVING & STORAGE INC | | | SCAC3 |
| 688 | CANO | CANNON MOVING & STORAGE INC | | | SCAC4 |
| 689 | CANP | CANADIAN PRIVATE | | | PWRC |
| 690 | CANP | CANUPP TRUCKING INC | | | SCAC3 |
| 691 | CANQ | CANO | | | SCAC4 |
| 692 | CANR | CANADIAN NATIONAL | | | PWRC |
| 693 | CANR | CANADA TRANSPORT INC | | | SCAC3 |
| 694 | CANS | CANNON BROTHERS | | | SCAC3 |
| 695 | CANS | CANNON BROTHERS | | | SCAC4 |
| 696 | CANT | Cantus Verkehrsgesellschaft mbH | | D | TRAFFIC |
| 697 | CANU | CHIMICA SARDA SRL | | I | BIC |
| 698 | CANU | Modcan Solutions | | | RSRV |
| 699 | CANU | CANADA MARITIME | | | SCAC3 |
| 700 | CANU | CANADA MARITIME AGENCIES, LIMITED | | | SCAC4 |
