| 11901 | COBX | *IMPERIAL OIL, LTD. | | | PWRC |
| 11902 | COBX | *UNION TANK CAR CO. [TRANSIT CO. LTD.] | | | PWRC |
| 11903 | COBX | *COBRE MINING COMPANY LIMITED | | | PWRC |
| 11904 | COBX | Cobre Mining | | | RSRV |
| 11905 | COBX | COBRA TRADING LLC | | | SCAC4 |
| 11906 | COBY | COBB, TY | | | SCAC3 |
| 11907 | COBZ | COORS BREWING | | | PWRC |
| 11908 | COC | Firma Conseta | Callsign: Conseta Air, | D | AVCODES |
| 11909 | COCA | CHAMBERS OIL COMPANY INC | | | SCAC3 |
| 11910 | COCB | COLUMBIANA COUNTY MOTOR CLUB INC | | | SCAC3 |
| 11911 | COCC | COMMON CENTS COURIER INC | | | SCAC4 |
| 11912 | COCD | COUNTS COACHES & TOURS INC | | | SCAC3 |
| 11913 | COCD | COMMAND FREIGHT ENTERPRISES | | | SCAC4 |
| 11914 | COCG | COLORADO AIR CARGO INC | | | SCAC3 |
| 11915 | COCG | COLORADO AIR CARGO INC | | | SCAC4 |
| 11916 | COCH | COACH TRANSPORT INC | | | SCAC4 |
| 11917 | COCI | CITY OF CLEVELAND | | | SCAC3 |
| 11918 | COCJ | CONTRACT COURIER SERVICES INC | | | SCAC3 |
| 11919 | COCL | COSTA CRUISE LINES NA | | | SCAC4 |
| 11920 | COCM | CONTRACTUAL CARRIERS INC | | | SCAC3 |
| 11921 | COCM | CONTRACTUAL CARRIERS INC | | | SCAC4 |
| 11922 | COCN | COLUMBUS-CINCINNATI TRUCKING CO, TH | | | SCAC3 |
| 11923 | COCN | CORRIGAN OIL CO NO II | | | SCAC4 |
| 11924 | COCO | COURTESY CONTAINER CORP | | | SCAC3 |
| 11925 | COCO | COLONIAL CONSOLIDATED INC | | | SCAC4 |
| 11926 | COCP | CONCORD TRUCKING COMPANY | | | SCAC3 |
| 11927 | COCP | CONCORD TRUCKING COMPANY | | | SCAC4 |
| 11928 | COCQ | CONTRACT CARRIERS CORP | | | SCAC3 |
| 11929 | COCQ | COATES, MICHAEL | | | SCAC4 |
| 11930 | COCR | COOKIE CARRIERS INC | | | SCAC4 |
| 11931 | COCSA | COMPAÑIA DE OBRAS CASTILLEJOS, S.A. | | ES | VKM |
| 11932 | COCT | COOK COAL TERMINAL | | | PWRC |
| 11933 | COCU | SAMSKIP MCL BV | | NL | BIC |
| 11934 | COCU | QEEST NORTH SEA LINE BV | | | SCAC4 |
| 11935 | COCV | COASTAL CARRIERS INC. | | | SCAC3 |
| 11936 | COCW | CONTRACT CARRIERS INC | | | SCAC3 |
| 11937 | COCX | Chevron Oronite Co., L.L.C. | added 1/2001; 7/2005 | | NAKINA |
| 11938 | COCX | California Cotton Oil Corp. | eliminated 7/1965 | | NAKINA |
| 11939 | COCX | Continental Chemical Co. | added 4/1973; 1/1975-1/1980; eliminated 4/1980 | | NAKINA |
| 11940 | COCX | California Cotton Oil Co. | 7/1935-4/1961 | | NAKINA |
| 11941 | COCX | Carbo Oil Co. (Rock Island Petroleum Co.) | 8/1920 | | NAKINA |
| 11942 | COCX | California Cotton Oil Corp. | Apr-38 | | NRHS |
| 11943 | COCX | California Cotton Oil Co. | 1/52-4/61 | | NRHS |
| 11944 | COCX | California Cotton Oil Corporation | eliminated 7/65 | | NRHS |
| 11945 | COCX | Continental Chemical Co. | added 4/73; 1/75-1/80; eliminated 4/80 | | NRHS |
| 11946 | COCX | Chevron Oronite Co., L.L.C. | added 1/2001 | | NRHS |
| 11947 | COCX | *ROCK ISLAND PETROLEUM CO. [CARBO OIL CO.] | | | PWRC |
| 11948 | COCX | *CALIFORNIA COTTON OIL CORP. | | | PWRC |
| 11949 | COCX | *CONTINENTAL CHEMICAL CO. | | | PWRC |
| 11950 | COCX | +CHEVRON ORONITE COMPANY, LLC | | | PWRC |
| 11951 | COCX | Chevron Oronite | | | RSRV |
| 11952 | COCX | CHEVRON ORONITE COMPANY LLC | | | SCAC4 |
| 11953 | COCY | CONCRETE MATERIALS SUPPLY INC | | | SCAC3 |
| 11954 | COCZ | CONTINENTAL OIL CO. | | | PWRC |
| 11955 | COD | Concordavia Ltd. | Callsign: Concordavia, | UA | AVCODES |
| 11956 | COD | Concordavia | | | ICAO1 |
| 11957 | CODB | COLUMBIA DISTRIBUTING CO | | | SCAC3 |
| 11958 | CODB | COLUMBIA DISTRIBUTING COMPANY | | | SCAC4 |
| 11959 | CODC | CONSOLIDATED DELIVERY CO INC | | | SCAC3 |
| 11960 | CODD | CONRAD, DALE TRUCKING | | | SCAC3 |
| 11961 | CODE | COOPERATIVE DELIVERY SERVICE INC | | | SCAC3 |
| 11962 | CODG | C O D E INC | | | SCAC3 |
| 11963 | CODG | CORO VIEW FARMS LTD | | | SCAC4 |
| 11964 | CODH | CASTOR TRADING CO OF THE MARSHALL I | | | SCAC4 |
| 11965 | CODI | COLORADO-DENVER/WAREHOUSE-DELIVERY, INC | | | SCAC3 |
| 11966 | CODJ | COLLINSON, DALE F | | | SCAC3 |
| 11967 | CODK | CONN, DON TRUCKING | | | SCAC3 |
| 11968 | CODM | R & R LOGISTICS | | | SCAC4 |
| 11969 | CODN | CONSOLIDATED DISTRIBUTING COMPANY | | | SCAC3 |
| 11970 | CODN | COLISH CREATIONS | | | SCAC4 |
| 11971 | CODQ | COMMERCIAL DELIVERY SERVICE | | | SCAC3 |
| 11972 | CODR | CO-OP DELIVERY SERVICE INC | | | SCAC3 |
| 11973 | CODS | CONDOR INDUSTRIES INC | | | SCAC4 |
| 11974 | CODT | COMMANDER TRANSPORTATION SERVICES I | | | SCAC4 |
| 11975 | CODU | CROSSOVER ASSET MANAGEMENT (SINGAPORE) PTE LTD | | SGP | BIC |
| 11976 | CODV | COURTESY PACKAGE DELIVERY CO | | | SCAC3 |
| 11977 | CODW | CONDIT WAREHOUSE | | | SCAC3 |
| 11978 | CODW | CARGO LINK LOGISTICS | | | SCAC4 |
| 11979 | CODX | CITY OF DULUTH | | | PWRC |
| 11980 | CODY | COSMETIC DELIVERY, INC | | | SCAC3 |
| 11981 | CODY | CLASSICO DOORS LLC | | | SCAC4 |
| 11982 | CODZ | CORDEROI MINIMG COMPANY | | | PWRC |
| 11983 | COE | Comitel, Bedarfsfluge KG | Callsign: Comtel-Air, | A | AVCODES |
| 11984 | COE | Colorado & Eastern Rd. Co. | added 5/1983; eliminated 1/1988 | | NAKINA |
| 11985 | COE | Colorado & Eastern Ry. Co. | added 7/1982; eliminated 5/1983 | | NAKINA |
| 11986 | COE | Colorado & Eastern Ry. Co. | added 7/82; eliminated 5/83 | | NRHS |
| 11987 | COE | Colorado & Eastern Rd. Co. | added 5/83; eliminated 1/88 | | NRHS |
| 11988 | COE | COLORADO & EASTERN RAILROAD (CEASED OPERATIONS 1987) | | | PWRC |
| 11989 | COE | Colorado and Eastern Railroad | | | RSRV |
| 11990 | COEA | COTE CORPORATION, THE | | | SCAC3 |
| 11991 | COEC | COE, CHARLES D | | | SCAC3 |
| 11992 | COEC | COASTAL ENTERPRISES LTD | | | SCAC4 |
| 11993 | COED | COMMERCIAL DISTRIBUTORS INC | | | SCAC3 |
| 11994 | COED | COMPONENTES ELECTRICOS DEL NORTE SR | | | SCAC4 |
| 11995 | COEE | CHEROKEE CARRIERS INC | | | SCAC3 |
| 11996 | COEF | CONTRANS INC | | | SCAC3 |
| 11997 | COEF | COEF s.r.l. | | IT | VKM |
| 11998 | COEH | Conecuh Valley R.R. | added 7/2003; eliminated 10/2003; 7/2005 | | NAKINA |
| 11999 | COEH | CONECUH VALLEY RAILROAD | | | PWRC |
| 12000 | COEH | Conecuh Valley Railroad | | | RSRV |
