| Abbreviation | Definition |
|---|---|
| CCTU | Coordinated Caribbean Transport Incorporated |
| CCTX | Central Power and Light |
| CCTX | Central Power and Light Company |
| CCTZ | Crowley Maritime Corporation |
| CCUO | Chicago-Chemung Railroad |
| CCUO | Chicago-Chemung Railroad Corporation |
| CCWX | Coastal Chem |
| CCWX | Coastal Chem Incorporated |
| CCX | Columbian Chemicals |
| CCX | Columbian Chemicals Co (Subsidiary of Phelps Dodge Corporation) |
| CCXU | Char Ching Shipping (USA) |
| CCXU | Char Ching Shipping (USA) Limited |
| CCXX | Costain Coal |
| CCXX | Costain Coal Incorporated |
| CD | eské Dráhy (Czech Railways) |
| CD | ??esk?? Dr??hy (Czech Railways) |
| CD | Ceské Dráhy (Czech Railways) |
| CDAC | Canadian American Railroad (Montreal, Maine and Atlantic) |
| CDAC | Canadian American Railroad Company |
| CDAU | Canadian Tire Corporation Limited |