| 11501 | CNSU | CNS Logistics | | | RSRV |
| 11502 | CNSV | C & S SERVICES INC | | | SCAC3 |
| 11503 | CNSW | CONSOLIDATED WAREHOUSES INC | | | SCAC3 |
| 11504 | CNSX | Consolidated Oil & Transportation Co., Inc. | added 1/1999; 7/2000; eliminated 4/2003; 7/2005 (not listed) | | NAKINA |
| 11505 | CNSX | Columbia Naval Stores Co. (General American Tank Car Corp.) | 7/1935 | | NAKINA |
| 11506 | CNSX | Columbia Naval Stores Co. | 8/1920 | | NAKINA |
| 11507 | CNSX | Columbia Naval Stores Co. (Columbia Naval Stores Co. of Delaware) | 7/1923-7/1932 | | NAKINA |
| 11508 | CNSX | Consolidated Oil & Transportation Co., Inc. | added 1/99; 7/2000 | | NRHS |
| 11509 | CNSX | *COLUMBIA NAVAL STORES CO. | | | PWRC |
| 11510 | CNSX | +CONSOLIDATED OIL & TRANSPORTATION, INC. | | | PWRC |
| 11511 | CNSX | Consolidated Oil and Transportation | | | RSRV |
| 11512 | CNSX | TRINITY INDUSTRIES LEASING COMPANY | | | SCAC4 |
| 11513 | CNSY | CRIPPEN NORTHLAND SUPERIOR SUPPLY C | | | SCAC4 |
| 11514 | CNSZ | NORTH SHORE MINIMG CO. [CYPRUS NORTH SHORE MINING] | | | PWRC |
| 11515 | CNT | Centre National D'etudes Des Telecommunications (C.N.E.T.) | | F | AVCODES |
| 11516 | CNT | Centre National D'etudes Des Telecommunications (C.N.E.T.) | Callsign: KNET, | F | AVCODES |
| 11517 | CNT | Connect Linhas Aereas S.A. | IATA: 6C, Callsign: Connect Cargo, IATA Prefix: 677, AOC voluntarily revoked on 16 March 2020. | BR | AVCODES |
| 11518 | CNT | CNET | | | ICAO1 |
| 11519 | CNTB | C & T INTERNAIONAL N V BELGIUM | | | SCAC3 |
| 11520 | CNTB | CONTROLLED PRODUCTS GROUP | | | SCAC4 |
| 11521 | CNTC | CENTRAL TRANSFER COMPANY | | | SCAC3 |
| 11522 | CNTC | CARINA TRANSPORT INC | | | SCAC4 |
| 11523 | CNTD | CENTRAL STATES TRANSIT LINES | | | SCAC3 |
| 11524 | CNTD | CONTRERAS HERNANDEZ, FLORENTINO | | | SCAC4 |
| 11525 | CNTD | City of Nelson Transit Department | | CDN | TRAFFIC |
| 11526 | CNTE | CONTAINER SYSTEMS | | | SCAC3 |
| 11527 | CNTE | CONTAINER SYSTEMS | | | SCAC4 |
| 11528 | CNTF | COLENUTT FARMS | | | SCAC4 |
| 11529 | CNTG | CENTRAL TRANSPORT COMPANY | | | SCAC3 |
| 11530 | CNTG | CONESTOGA TRUCKING LTD | | | SCAC4 |
| 11531 | CNTH | CENTRAL TRANSPORTATION CO INC | | | SCAC3 |
| 11532 | CNTH | CENTRAL TRANSPORT COMPANY | | | SCAC4 |
| 11533 | CNTI | CONTRANS INC | | | SCAC3 |
| 11534 | CNTI | COTRONE TRUCKING | | | SCAC4 |
| 11535 | CNTJ | CENTRAL UNION WAREHOUSES INC | | | SCAC3 |
| 11536 | CNTJ | CENTRAL UNION WAREHOUSES INC | | | SCAC4 |
| 11537 | CNTK | CHARON TRANSPORT | | | SCAC3 |
| 11538 | CNTM | CARLYN TRANSPORT LLC | | | SCAC4 |
| 11539 | CNTN | CENTROPOLIS TRANSFER CO, INC | | | SCAC3 |
| 11540 | CNTO | CONNORS TRANSPORTATION COMPANY | | | SCAC4 |
| 11541 | CNTP | The Cincinnati, New Orleans and Texas Pacific Ry. Co. | 1/1975-7/2005 | | NAKINA |
| 11542 | CNTP | The Cincinnati, New Orleans and Texas Pacific Ry. Co. | 1/75-7/2000 | | NRHS |
| 11543 | CNTP | CINCINNATI, NEW ORLEANS & TEXAS PACIFIC (NORFOLK SOUTHERN) [SOUTHERN] | | | PWRC |
| 11544 | CNTP | Cincinnati, New Orleans and Texas Pacific Railway | | | RSRV |
| 11545 | CNTP | CINCINNATI NEW ORLEANS AND TEXAS PA | | | SCAC3 |
| 11546 | CNTR | CENTERVILLE TRUCK LINE, INC | | | SCAC3 |
| 11547 | CNTR | CAIN TRUCKING | | | SCAC4 |
| 11548 | CNTS | COUNTRYSIDE TOURS INC | | | SCAC3 |
| 11549 | CNTS | CANAAN, T D | | | SCAC4 |
| 11550 | CNTT | CENTRAL TRANSPORT, INCORPORATED | | | SCAC3 |
| 11551 | CNTU | CONTAINERS OF UKRAINE | | UA | BIC |
| 11552 | CNTU | ITL Technology | | | RSRV |
| 11553 | CNTU | TRANSICOLD | | | SCAC3 |
| 11554 | CNTU | ITLT SOLUTIONS | | | SCAC4 |
| 11555 | CNTV | CLINTON TRAVEL | | | SCAC3 |
| 11556 | CNTW | COURIER NETWORK INC | | | SCAC4 |
| 11557 | CNTX | Continental Tank Car Corp. | 7/1965-7/2005; eliminated 1/2006; added 4/2006 | | NAKINA |
| 11558 | CNTX | Central Tube Co. | 7/1923 | | NAKINA |
| 11559 | CNTX | Continental Tank Car Corp. | 7/65-7/2000 | | NRHS |
| 11560 | CNTX | *CENTRAL TUBE CO. | | | PWRC |
| 11561 | CNTX | +CONTINENTAL TANK CAR CORPORATION | | | PWRC |
| 11562 | CNTX | Continental Tank Car Corporation | | | RSRV |
| 11563 | CNTX | CONTINENTAL TANK CAR CORP | | | SCAC3 |
| 11564 | CNTX | CONTINENTAL TANK CAR CORPORATION | | | SCAC4 |
| 11565 | CNTX | Continental Tank Car Corp. | | USA | TRAFFIC |
| 11566 | CNTZ | CANADIAN NATIONAL RAILWAYS | | | SCAC4 |
| 11567 | CNU | Air Consul | Callsign: Air Consul, | E | AVCODES |
| 11568 | CNU | Air Consul | | | ICAO1 |
| 11569 | CNU | COMPANIA NATIONALA A URANIULUI S.A. | | RO | VKM |
| 11570 | CNUA | CONNAMERICAN INC | | | SCAC3 |
| 11571 | CNUB | CONSTITUTION COACH INC | | | SCAC3 |
| 11572 | CNUC | CONNECTICUT COURIER INC | | | SCAC3 |
| 11573 | CNUC | CARLSON TRUCKING | | | SCAC4 |
| 11574 | CNUD | CHESTNUT RIDGE TRANSIT INC | | | SCAC3 |
| 11575 | CNUE | CONSOLIDATED FUELS OF NC | | | SCAC3 |
| 11576 | CNUE | CONTINENTAL TIRE | | | SCAC4 |
| 11577 | CNUF | CANTU, FERNANDO | | | SCAC4 |
| 11578 | CNUG | CARLTON TRUCKING | | | SCAC3 |
| 11579 | CNUG | CONACHER CUSTOM GRANITE INC | | | SCAC4 |
| 11580 | CNUH | CHESTNUT HILL LIMOUSINE & COACH CO | | | SCAC3 |
| 11581 | CNUI | CONSOLIDATIONS UNLIMITED INC | | | SCAC3 |
| 11582 | CNUI | CONSOLCARGO USA INC | | | SCAC4 |
| 11583 | CNUK | CLINTON TRUCKING | | | SCAC3 |
| 11584 | CNUL | CENTURION TRANSPORT LLC | | | SCAC4 |
| 11585 | CNUM | CONSUMERS MOVING CO INC | | | SCAC3 |
| 11586 | CNUN | CENTURION NVOCC INC | | | SCAC3 |
| 11587 | CNUP | COLIN DALE CO. S A | | | SCAC3 |
| 11588 | CNUQ | COLTON AUTO INC | | | SCAC4 |
| 11589 | CNUR | C & NC R.R. Corp. | added 7/1998; 7/2000-7/2005 | | NAKINA |
| 11590 | CNUR | C & NC R.R. Corp. | added 7/98; 7/2000 | | NRHS |
| 11591 | CNUR | C & NC RAILROAD CORPORATION | | | PWRC |
| 11592 | CNUR | C&NC Railroad | | | RSRV |
| 11593 | CNUR | C & NC RAILROAD CORPORATION | | | SCAC4 |
| 11594 | CNUR | C&NC Railroad | | USA | TRAFFIC |
| 11595 | CNUS | CHEM-NUCLEAR SYSTEMS INC | | | SCAC3 |
| 11596 | CNUT | CONUS TRANSPORTATION | | | SCAC3 |
| 11597 | CNUT | CONUS TRANSPORTATION INC | | | SCAC4 |
| 11598 | CNUV | CENTURY VAN LINES INC | | | SCAC3 |
| 11599 | CNUV | CENTURY VAN LINES INC | | | SCAC4 |
| 11600 | CNUY | CENTURY TRANSPORTAITON CONSULTANT S | | | SCAC3 |
