| 1 | COL | Columbia Airlines Ltd. | Callsign: Colair, | CDN | AVCODES |
| 2 | COL | Columba Air d.o.o. | Callsign: Columba Air, Ceased operations. | HR | AVCODES |
| 3 | COL | SC Aviation | Callsign: Colony, ICAO designator changed from CHR. ICAO callsign changed from Cheese Maker. | USA | AVCODES |
| 4 | COL | Columbia Airlines | | | ICAO1 |
| 5 | COL | COLUMBIANA COACH LINES INC | | | SCAC4 |
| 6 | COLA | COLAW, GERALD | | | SCAC3 |
| 7 | COLA | COLAW, GERALD | | | SCAC4 |
| 8 | COLA | Coca Cola | | X | TRAFFIC |
| 9 | COLAS | Colas Rail Ltd. | | GB | TRAFFIC |
| 10 | COLAS | COLAS Epito Zrt | | HU | VKM |
| 11 | COLB | COLBERTS TRANSFER, INC | | | SCAC3 |
| 12 | COLB | CONSOLIDATED LUMBER TRANSPORT INC | | | SCAC4 |
| 13 | COLC | COLE TRANSFER & STORAGE COMPANY | | | SCAC3 |
| 14 | COLC | Colonial Coach | City: Morristown, NJ | USA | TRAFFIC |
| 15 | COLE | COLES EXPRESS, INC | | | SCAC3 |
| 16 | COLE | CDL INC | | | SCAC4 |
| 17 | COLH | COOL TRANSPORTS INCORPORATED | | | SCAC3 |
| 18 | COLH | COOL TRANSPORTS | | | SCAC4 |
| 19 | COLI | Colonel's Island | 1/1975-1/1980 | | NAKINA |
| 20 | COLI | Colonel's Island | 1/75-1/80 | | NRHS |
| 21 | COLI | COLONIAL'S ISLAND | | | PWRC |
| 22 | COLI | COLEMAN AMERICAN MOVING SERVICES IN | | | SCAC3 |
| 23 | COLI | COLEMAN AMERICAN MOVING SERVICES IN | | | SCAC4 |
| 24 | COLJ | COLE JACK-DIXIE HIGHWAY COMPANY | | | SCAC3 |
| 25 | COLN | CHEMOIL CORPORATION | | | SCAC4 |
| 26 | COLO | COLORADO ALL STATE TRANSPORTATION I | | | SCAC3 |
| 27 | COLO | CAST TRANSPORTATION INC | | | SCAC4 |
| 28 | COLP | COLLIER TRANSFER & STORAGE | | | SCAC3 |
| 29 | COLP | COLMAR LTD | | | SCAC4 |
| 30 | COLR | COLORADO COUNTY OIL INC | | | SCAC4 |
| 31 | COLRA | SECO RAIL | | FR | VKM |
| 32 | COLT | COLLINS TRANSPORTATION | | | SCAC3 |
| 33 | COLT | COLLIER TRANSFER INC | | | SCAC4 |
| 34 | COLU | COLAS AFRIQUE COTE D'IVOIRE | | CI | BIC |
| 35 | COLU | XTRA INTRAMODAL [(XTRZ) XTRA LEASE] | | | PWRC |
| 36 | COLU | CONTAINER REPAIR CO | | | SCAC4 |
| 37 | COLV | COLONIAL VAN LINES, INC | | | SCAC3 |
| 38 | COLV | CARPENTER OIL CO | | | SCAC4 |
| 39 | COLW | COLONIAL WAREHOUSE & DISTRIBUTING C | | | SCAC3 |
| 40 | COLW | COOLWATER QUARTER HORSES | | | SCAC4 |
| 41 | COLX | Alliant Energy | added 4/2000; 7/2000-7/2005 | | NAKINA |
| 42 | COLX | Wisconsin Power & Light Co. | 1/1994 (not listed) | | NAKINA |
| 43 | COLX | North American Car Corp. | added 1/1966; 10/1966-1/1980; eliminated 7/1982 | | NAKINA |
| 44 | COLX | Collins Construction Co. | 1/1950-1/1952; eliminated 7/1953 | | NAKINA |
| 45 | COLX | Collins Construction Co. | Jan-52 | | NRHS |
| 46 | COLX | North American Car Corp. | added 1/66; 10/66-1/80; eliminated 7/82 | | NRHS |
| 47 | COLX | Wisconsin Power & Light Co. | Jan-94 | | NRHS |
| 48 | COLX | Alliant Energy | added 4/2000; 7/2000 | | NRHS |
| 49 | COLX | *COLLINS CONSTRUCTION CO. | | | PWRC |
| 50 | COLX | *NORTH AMERICAN CAR CORP. | | | PWRC |
| 51 | COLX | +ALLIANT ENERGY (WISX) (WISCONSIN POWER & LIGHT COMPANY) | | | PWRC |
| 52 | COLX | Collins Construction Co. (Alliant Energy) | | | RSRV |
| 53 | COLX | ALLIANT ENERGY | | | SCAC4 |
| 54 | COLY | COLLEY, G A TRANSPORTATION CO | | | SCAC3 |
| 55 | COLY | COLYER TRUCKING LLC | | | SCAC4 |
| 56 | COLZ | XTRA INTRAMODAL [(XTRZ) XTRA LEASE] | | | PWRC |
