| 1 | CER | Celmar Servicios Aereos, S.A. de C.V. | Callsign: Celmar, | MEX | AVCODES |
| 2 | CER | Cetraca Aviation Service | Callsign: Cetraca, | ZRE | AVCODES |
| 3 | CER | Cosmopolitan Air Operations, S.A.P.I. de C.V. | Callsign: Cosmer, | MEX | AVCODES |
| 4 | CER | Cetraca Aviation Service | | | ICAO1 |
| 5 | CER | CHARTER BUSSES INC | | | SCAC4 |
| 6 | CER | Central-European Railway AG | | H | TRAFFIC |
| 7 | CER | Central-European Railway AG. | | HU | VKM |
| 8 | CERA | Central R.R. Co. of Indianapolis | added 7/1989; eliminated 7/1993; 1/1994-7/2005; eliminated 1/2009 | | NAKINA |
| 9 | CERA | Central R.R. Co. of Indianapolis | added 7/89; eliminated 7/93; 1/94-7/2000 | | NRHS |
| 10 | CERA | CENTRAL RAILROAD COMPANY OF INDIANAPOLIS | | | PWRC |
| 11 | CERA | Central Railroad of Indianapolis | | | RSRV |
| 12 | CERA | CENTRAL RAILROAD COMPANY OF INDIANA | | | SCAC3 |
| 13 | CERB | CERTIFIED MOVING & STORAGE CO INC | | | SCAC3 |
| 14 | CERB | Centralna Energoremontna Baza AD / Централна Енергоремонтна База АД | | BG | VKM |
| 15 | CERC | CHAMBERS, ROOSEVELT | | | SCAC3 |
| 16 | CERE | CERES TRANSPORTATION GROUP INC | | | SCAC4 |
| 17 | CERF | CLEMENS REFRIGERATED DELIVERY | | | SCAC3 |
| 18 | CERG | CHACE, C R & SON | | | SCAC3 |
| 19 | CERG | CRAINE, ROGER | | | SCAC4 |
| 20 | CERH | CANTON ERECTORS INC | | | SCAC3 |
| 21 | CERH | CANTON ERECTORS INC | | | SCAC4 |
| 22 | CERI | CANDID ENTERPRISES INC | | | SCAC3 |
| 23 | CERJ | CERVANTES, JESS INC | | | SCAC3 |
| 24 | CERL | CENTRAL PETROLEUM COMPANY | | | SCAC3 |
| 25 | CERM | CERTIFIED MOVING SYSTEMS INC | | | SCAC3 |
| 26 | CERM | CAT PERTOLEUM TRANSPORT INC | | | SCAC4 |
| 27 | CERN | COMMERCIAL TRANSPORT (NORTHERN) LIM | | | SCAC4 |
| 28 | CERO | CENTAURO U S A | | | SCAC3 |
| 29 | CERO | CERONI TRUCKING | | | SCAC4 |
| 30 | CEROV | COMPLEX ENERGETIC ROVINARI SA | | RO | VKM |
| 31 | CERP | CONSUMERS ENTERPRISE INC | | | SCAC3 |
| 32 | CERP | COOPER TRANSPORTATION LLC | | | SCAC4 |
| 33 | CERQ | CARRIER TRANSFER COMPANY INC | | | SCAC3 |
| 34 | CERR | CERRONE, ARMOND INC | | | SCAC3 |
| 35 | CERSK | CER Slovakia a.s. | | SK | VKM |
| 36 | CERT | CERTIFIED FREIGHT LINES INC | | | SCAC3 |
| 37 | CERT | CERTIFIED FREIGHT LOGISTICS INC | | | SCAC4 |
| 38 | CERU | RIVERSIDE RESOURCE RECOVERY LTD | | GB | BIC |
| 39 | CERU | CERESTAR SCANDINAVIA A/S | | | SCAC3 |
| 40 | CERV | CERTIFIED VAN SERVICE | | | SCAC3 |
| 41 | CERV | CERTIFIED VAN SERVICE | | | SCAC4 |
| 42 | CERW | CERWIN TRANSPORTATION SYSTEM INC | | | SCAC3 |
| 43 | CERX | Union Tank Car Co. | added 10/2006 | | NAKINA |
| 44 | CERX | E.R. Carpenter Co., L.P. | added 4/2000; 7/2000-7/2005; eliminated 10/2006 | | NAKINA |
| 45 | CERX | Carpenter Co. | added 1/2000; eliminated 4/2000 | | NAKINA |
| 46 | CERX | Carpenter Chemical Co. | eliminated 1/1991; 1/1994 (not listed) | | NAKINA |
| 47 | CERX | Carpenter Chemical Co., a subsidiary of E.R. Carpenter Co., Inc. | added 10/1977; 1/1980 | | NAKINA |
| 48 | CERX | Choate Chemical Co., a subsidiary of E.R. Carpenter Co., Inc. | added 7/1973; 1/1975; eliminated 10/1977 | | NAKINA |
| 49 | CERX | Custom Equipment Rentals, Inc. Division of United States Freight Co. | eliminated 7/1966 | | NAKINA |
| 50 | CERX | Custom Equipment Rentals, Inc. | added 4/1966 | | NAKINA |
| 51 | CERX | Custom Truck Rental Corp., Division of United States Freight Co. | eliminated 7/1962 | | NAKINA |
| 52 | CERX | Custom Truck Rental Corp. | added 1/1962 | | NAKINA |
| 53 | CERX | Central Refining Co. (Indian Refining Co., Inc.) | 7/1930 | | NAKINA |
| 54 | CERX | Central Refining Co. | 8/1920-7/1923 | | NAKINA |
| 55 | CERX | Custom Truck Rental Corp. | added 1/62 | | NRHS |
| 56 | CERX | Custom Equipment Rentals, Inc. | added 4/66 | | NRHS |
| 57 | CERX | Custom Equipment Rentals, Inc. Division of United States Freight Co. | eliminated 7/66 | | NRHS |
| 58 | CERX | Choate Chemical Co., a subsidiary of E.R. Carpenter Co., Inc. | added 7/73; 1/75 | | NRHS |
| 59 | CERX | Carpenter Chemical Co., a subsidiary of E.R. Carpenter Co., Inc. | Jan-80 | | NRHS |
| 60 | CERX | Carpenter Chemical Co. | eliminated 1/91; 1/94 | | NRHS |
| 61 | CERX | Carpenter Co. | added 1/2000; eliminated 4/2000 | | NRHS |
| 62 | CERX | E.R. Carpenter Co., L.P. | added 4/2000; 7/2000 | | NRHS |
| 63 | CERX | *CENTRAL REFINING CO (INDIAN REFINING CO. INC.) | | | PWRC |
| 64 | CERX | *CUSTOM EQUIPMENT RENTALS DIV. UNITED STATES FREIGHT CO. | | | PWRC |
| 65 | CERX | *E. R. CARPENTER CO. LP CARPENTER CHEMICAL COMPANY; CHOATE CHEMICAL CO.] | | | PWRC |
| 66 | CERX | +UNION TANK CAR CO. | | | PWRC |
| 67 | CERX | Carpenter Chemical (ER Carpenter) | | | RSRV |
| 68 | CERX | UNION TANK CAR | | | SCAC4 |
| 69 | CERY | CENTURY TRANSPORTATION CORPORATION | | | SCAC3 |
| 70 | CERY | CERES SOLUTIONS LLP | | | SCAC4 |
| 71 | CERZ | CONNECTICUT ELECTRIC RAILWAY | | | PWRC |
| 72 | CERZ | COMMERCIT S A, | | | SCAC3 |
