| 12901 | CPAX | CITGO Petroleum Corporation | | | RSRV |
| 12902 | CPAX | CITGO PETROLEUM CORP. | | | SCAC4 |
| 12903 | CPAY | CAL PAC TRANSPORT INCORPORATED | | | SCAC3 |
| 12904 | CPAZ | COPLANT | | | PWRC |
| 12905 | CPB | Corpac Canada Ltd. | Callsign: Penta, Ceased Operations on 18 June 2009. | CDN | AVCODES |
| 12906 | CPB | Corpac Canada | | | ICAO1 |
| 12907 | CPB | Companhia Paulista de Estradas de Ferro / S?o Paulo Railway Company | Real: CP | BR | TRAFFIC |
| 12908 | CPBA | CAPABLE TRANSPORT INC | | | SCAC4 |
| 12909 | CPBB | CAPITOL BUS CO | | | SCAC3 |
| 12910 | CPBB | CARDINAL SHIPPING LLC | | | SCAC4 |
| 12911 | CPBC | CAMPBELL OIL COMPANY | | | SCAC4 |
| 12912 | CPBE | CAMPBELL FREIGHT INC | | | SCAC4 |
| 12913 | CPBG | CORP TRANSPORTATION BROKERAGE | | | SCAC3 |
| 12914 | CPBG | CONE TRANSPORTATION | | | SCAC4 |
| 12915 | CPBH | CAMPER BROTHERS TRUCKING | | | SCAC3 |
| 12916 | CPBI | CRANE PLUMBING INC | | | SCAC3 |
| 12917 | CPBJ | CHAMPION BUS CO INC | | | SCAC3 |
| 12918 | CPBJ | CAMPBELL, GERRY TRUCKING | | | SCAC4 |
| 12919 | CPBK | CP BULK SHIPS | | | SCAC3 |
| 12920 | CPBN | CORSO, P BANANA TRANSPORT | | | SCAC3 |
| 12921 | CPBO | CAMPBELL BROS MOVING & STORAGE CO | | | SCAC3 |
| 12922 | CPBP | COLOPINTO BUS CO | | | SCAC3 |
| 12923 | CPBQ | CAMPBELL TRANSPORTATION | | | SCAC3 |
| 12924 | CPBR | CRUMP BROS TRUCKING INC | | | SCAC3 |
| 12925 | CPBS | CAMPBELL, S B INC | | | SCAC3 |
| 12926 | CPBS | CAMERO TRANSPORT INC | | | SCAC4 |
| 12927 | CPBT | CAMPBELL TRUCKING | | | SCAC3 |
| 12928 | CPBU | CANONS PARK EQUIPMENT CO LTD | | HK | BIC |
| 12929 | CPBU | SOO LINE RAILROAD | | | PWRC |
| 12930 | CPBU | Soo Line (Canadian Pacific Railway) | | | RSRV |
| 12931 | CPBU | CP RAIL INTERMODAL FREIGHT SYSTEM | | | SCAC3 |
| 12932 | CPBU | CP RAIL INTERMODAL FREIGHT SYSTEM | | | SCAC4 |
| 12933 | CPBW | CANADIAN PACIFIC (BERMUDA) LIMITED | | | SCAC3 |
| 12934 | CPBX | Cattle Car Leasing Co. | added 4/1968 | | NAKINA |
| 12935 | CPBX | Cattle Car Leasing Co. | added 4/68 | | NRHS |
| 12936 | CPBX | CATTLE CAR LEASING CO. | | | PWRC |
| 12937 | CPBY | CAMPBELL OIL CO | | | SCAC4 |
| 12938 | CPBZ | SOO LINE RAILROAD | | | PWRC |
| 12939 | CPBZ | Soo Line (Canadian Pacific Railway) | | | RSRV |
| 12940 | CPBZ | SOO LINE RAILROAD | | | SCAC4 |
| 12941 | CPC | CP Air | IATA: CP, Callsign: Empress, Bought by Pacific Western and merged to form Canadian Airlines International | CDN | AVCODES |
| 12942 | CPC | Aero Campeche, C.A. de C.V. | Callsign: Aerocampeche, | MEX | AVCODES |
| 12943 | CPC | Canadian Pacific Airlines Ltd. | IATA: CP, Callsign: Empress, Name changed to Canadian Airlines International Ltd. Name changed from CP Air | CDN | AVCODES |
| 12944 | CPC | *COLLINS PINE COMPANY | | | PWRC |
| 12945 | CPC | +CHICAGO PORT RAILROAD CO. | | | PWRC |
| 12946 | CPC | CHICAGO PORT RAILROAD | | | SCAC4 |
| 12947 | CPCA | CLELIAMAR PRODUCT CARRIER CORPORATI | | | SCAC4 |
| 12948 | CPCB | CORPORATE COURIER INC | | | SCAC3 |
| 12949 | CPCB | COOPER FUEL & AUTO REPAIR | | | SCAC4 |
| 12950 | CPCD | CAPE COD EXPRESS, INC | | | SCAC3 |
| 12951 | CPCD | CAPE COD EXPRESS INC | | | SCAC4 |
| 12952 | CPCE | COAST PACIFIC CARRIER INC | | | SCAC4 |
| 12953 | CPCF | CHAMPAGNE CARRIERS | | | SCAC3 |
| 12954 | CPCF | CHAMPAGNE CARRIERS | | | SCAC4 |
| 12955 | CPCG | CHESAPEAKE CARTAGE INC | | | SCAC3 |
| 12956 | CPCG | CAPE CARGO INC | | | SCAC4 |
| 12957 | CPCH | CHAMPION CARTAGE CO INC | | | SCAC3 |
| 12958 | CPCH | CHAMPION CARTAGE CO INC | | | SCAC4 |
| 12959 | CPCK | C-PAC TRUCKING INC | | | SCAC3 |
| 12960 | CPCK | C P TRUCKING LLC | | | SCAC4 |
| 12961 | CPCL | C P C LEASING CORPORATION | | | SCAC3 |
| 12962 | CPCLP | CP Cargo Logistica e Transoportes Ferroviários de Mercadorias, SA | | PT | VKM |
| 12963 | CPCM | CAPITOL CITY MOVING & STORAGE INC | | | SCAC3 |
| 12964 | CPCN | CAPITOL COACHES COMPANY | | | SCAC3 |
| 12965 | CPCO | COMPTON PLASTER CO INC | | | SCAC3 |
| 12966 | CPCP | CPC PUMPS INTERNATIONAL | | | SCAC4 |
| 12967 | CPCQ | C P CARTAGE | | | SCAC3 |
| 12968 | CPCQ | CITRUS TRANSPORT LLC | | | SCAC4 |
| 12969 | CPCR | CAPRICORN WAFERS | | | SCAC4 |
| 12970 | CPCT | CAPRICORN TRANSPORTATION INC | | | SCAC4 |
| 12971 | CPCU | SHENZHEN CAPCHEM TECHNOLOGY CO.,LTD. | | PRC | BIC |
| 12972 | CPCU | CPC INDUSTRIPRODUKTER A/S | | | SCAC3 |
| 12973 | CPCU | CHEVRON PHILLIPS CHEMICAL COMPANY | | | SCAC4 |
| 12974 | CPCV | COMPUTER CARRIER CORPORATION | | | SCAC3 |
| 12975 | CPCV | CPC TRUCKING | | | SCAC4 |
| 12976 | CPCW | CAPITAL CHARTERWAYS INC | | | SCAC3 |
| 12977 | CPCW | CATS PAW PRODUCTS | | | SCAC4 |
| 12978 | CPCX | Chevron Phillips Chemical Co. L.P. | added 1/2001; 7/2005 | | NAKINA |
| 12979 | CPCX | CPS Chemical Co., Inc. | 1/1994-7/2000 (not listed) | | NAKINA |
| 12980 | CPCX | Whittaker Corp., Providence Coatings & Chemicals Division | added 10/1980; eliminated 1/1981 | | NAKINA |
| 12981 | CPCX | CPL Corp., Chemical Products Division | added 4/1977; 1/1980; eliminated 10/1980 | | NAKINA |
| 12982 | CPCX | Chemical Products Corp. | added 1/1969; 4/1970-1/1975; eliminated 4/1977 | | NAKINA |
| 12983 | CPCX | Cosden Petroleum Corp. | 7/1937-4/1961; eliminated 10/1964 | | NAKINA |
| 12984 | CPCX | Cosden Petroleum Corp. | 4/38-4/61 | | NRHS |
| 12985 | CPCX | Chemical Products Corp. | added 1/69; 4/70-1/75 | | NRHS |
| 12986 | CPCX | CPL Corp., Chemical Products Division | 1/80; eliminated 10/80 | | NRHS |
| 12987 | CPCX | Whittaker Corp., Providence Coatings & Chemicals Division | added 10/80; eliminated 1/81 | | NRHS |
| 12988 | CPCX | CPS Chemical Co., Inc. | 1/94-7/2000 | | NRHS |
| 12989 | CPCX | Chevron Phillips Chemical Co. L.P. | added 1/2001 | | NRHS |
| 12990 | CPCX | *COSDEN PETROLEUM CORP. | | | PWRC |
| 12991 | CPCX | *WHITTAKER CORP, PROVIDENCE COATINGS & CHEMICALS DIV. [CPL CORP.; CHEMICAL PRODUCTS CORP.] | | | PWRC |
| 12992 | CPCX | *CPS CHEMICAL COMPANY [RETIRED 04-26-94 ATP] | | | PWRC |
| 12993 | CPCX | +CHEVRON PHILLIPS CHEMICAL CO. LP | | | PWRC |
| 12994 | CPCX | Chevron Phillips Chemical | | | RSRV |
| 12995 | CPCX | CHEVRON PHILLIPS CHEMICAL COMPANY L | | | SCAC4 |
| 12996 | CPCY | CAPITAL CITY TRANSFER | | | SCAC3 |
| 12997 | CPCZ | CORN PRODUCTS COMPANY | | | PWRC |
| 12998 | CPD | Capital Airlines Limited | Callsign: Capital Delta, Founded in 1993. | EAK | AVCODES |
| 12999 | CPD | Capital Airlines | | | ICAO1 |
| 13000 | CPDA | CORPORATE RELOCATION INC | | | SCAC3 |
