| Christmas Island |
|
| Cilicia |
|
| Cinderellas |
|
| Ciskei |
|
| Cochin |
|
| Cochin China |
|
| Cocos (Keeling) Islands |
|
| Colombia |
|
| Colombia, Antioquia |
|
| Colombia, Bolivar |
|
| Colorado (CO) |
|
| Comoros |
|
| Comoros- Revenue Stamps |
|
| Confederate States of America |
|
| Congo, Dem. Rep. (Kinshasa)- Illegal Stamps |
|
| Congo, Democratic Republic (Kinshasa) |
|
| Congo, Free State |
|
| Congo, Republic (Brazzaville) |
|
| Congo, Republic (Brazzaville)- Illegal Stamps |
|
| Connecticut (CT) |
|