| 1 | COR | CONRAIL [READING CO.] [CORNWELL RR] | | | PWRC |
| 2 | COR | COTTRELL BUS SERVICE INC | | | SCAC4 |
| 3 | CORAM | Coram Bus Service | | USA | TRAFFIC |
| 4 | CORB | CORBET INC | | | SCAC3 |
| 5 | CORD | CORDAL TRANSPORTATION INC | | | SCAC4 |
| 6 | CORE | CORE MASTER INC | | | SCAC4 |
| 7 | CORF | CORE CARRIERS INC | | | SCAC3 |
| 8 | CORH | CORBITT, WILLIAM INC | | | SCAC3 |
| 9 | CORI | COLONIAL RUBBER WORKS INC | | | SCAC3 |
| 10 | CORI | CORRAL LINE A/S | | | SCAC4 |
| 11 | CORJ | CORNELL, LOWELL R | | | SCAC3 |
| 12 | CORJ | CORTLANDT TRANSPORTATION INC | | | SCAC4 |
| 13 | CORK | CORKERY FUEL & MATERIALS COMPANY | | | SCAC3 |
| 14 | CORK | CORKYS BAR-B-Q | | | SCAC4 |
| 15 | CORL | CORLETT, JERRY VENCL, MOVERS & STOR | | | SCAC3 |
| 16 | CORM | COOLEY, RONALD M | | | SCAC4 |
| 17 | CORN | CORNELL SYSTEMS INC | | | SCAC3 |
| 18 | CORO | CORNELSEN MOVING & STORAGE | | | SCAC3 |
| 19 | CORP | Central Oregon & Pacific R.R., Inc. | added 4/1995; 7/2000-7/2005; eliminated 7/2009 | | NAKINA |
| 20 | CORP | Central Oregon & Pacific R.R., Inc. | added 4/95; 7/2000 | | NRHS |
| 21 | CORP | CENTRAL OREGON & PACIFIC RAILROAD | | | PWRC |
| 22 | CORP | Central Oregon and Pacific Railroad | | | RSRV |
| 23 | CORP | CENTRAL OREGON & PACIFIC RAILROAD I | | | SCAC4 |
| 24 | CORP | Central Oregon & Pacific R.R., Inc | | USA | TRAFFIC |
| 25 | CORQ | COMMERCIAL TRANSPORTATION CO | | | SCAC3 |
| 26 | CORR | CORRIGAN AIR & SEA CARGO SYSTEMS | | | SCAC4 |
| 27 | CORS | COLORADO SKIER EXPRESS INC | | | SCAC3 |
| 28 | CORT | CORTLAND TRUCK SERVICE INC | | | SCAC3 |
| 29 | CORT | CORRECAMINOS TRANSPORT | | | SCAC4 |
| 30 | CORT | Servizi Ampezzo srl | | I | TRAFFIC |
| 31 | CORU | CARU CONTAINERS BV | | NL | BIC |
| 32 | CORU | CATU CONTAINERS S.A. | | | PWRC |
| 33 | CORU | CATU Containers | | | RSRV |
| 34 | CORU | CONTAINER ASSOCIATION ROTTERDAM BV | | | SCAC4 |
| 35 | CORV | CORVALLIS MOVING & STORAGE | | | SCAC3 |
| 36 | CORX | Coors Brewing Co. | added 7/1989; 1/1994-7/2005; eliminated 7/2009 | | NAKINA |
| 37 | CORX | Adolph Coors Co. | added 1/1987; eliminated 7/1989 | | NAKINA |
| 38 | CORX | Crystal Oil Refining Corp. | 7/1932 | | NAKINA |
| 39 | CORX | Burford Oil Co. (Crystal Oil Refining Corp.) | 7/1930 | | NAKINA |
| 40 | CORX | Caddo Central Oil & Refining Corp. | 8/1920-7/1923 | | NAKINA |
| 41 | CORX | Adolph Coors Co. | added 1/87; eliminated 7/89 | | NRHS |
| 42 | CORX | Coors Brewing Co. | added 7/89; 1/94-7/2000 | | NRHS |
| 43 | CORX | *CADDO CENTRAL OIL & REFINING CORP. | | | PWRC |
| 44 | CORX | *CRYSTAL OIL REFINING CORP. [BURFORD OIL CO.] | | | PWRC |
| 45 | CORX | *COUNTRY MARK RAILROAD | | | PWRC |
| 46 | CORX | +COORS BREWING COMPANY [ADOLPH COORS CO.] | | | PWRC |
| 47 | CORX | Coors Brewing | | | RSRV |
| 48 | CORX | COORS BREWING COMPANY | | | SCAC4 |
| 49 | CORX | Coors Brewing Co. | | USA | TRAFFIC |
| 50 | CORY | COLUMBUS & READING RAILWAY CO. | | | PWRC |
| 51 | CORY | COLUMBIA & READING RAILWAY CO | | | SCAC4 |
| 52 | CORZ | CONOCO REFINERY | | | PWRC |
| 53 | CORZ | CORMETAL SALES & RENTALS INC | | | SCAC4 |
