| Abbreviation | Definition |
|---|---|
| CM | Chief Minister |
| CNC | Charlotte, North Carolina |
| CNCS | Confederated Northern City States |
| CNHP | Colonial National Historical Park |
| CO | Colorado |
| CO | olorado |
| COB | California Oregon Border |
| COLA | County Of Los Angeles |
| COLO | Colorado |
| COSA | City Of Saint Augustine |
| COTUS | Cookie of the United States |
| COTUS | Cunt Of The United States |
| COTUS | Curator Of The United States |
| COW | California Oregon Washington |
| CPTA | California Pharmacy Technician Association |
| CSA | Communist States of America |
| CSAC | Colonial States Athletic Conference |
| CSAL | Canada States Africa Line |
| CSAS | Central States Anthropological Society |
| CSBBA | Central States Beef-Master Breeders Association |