| Cabinda | |
| California | |
| Cambay | |
| Cambodia | |
| Cameroon (German) | |
| Cameroon | |
| Canada | |
| Canary Islands | |
| Cantabria | |
| Cape Colony | |
| Cape Verde | |
| Carolina, North | |
| Carolina, South | |
| Cartagena de Indias | |
| Catalonia | |
| Cayman Islands | |
| Ceará | |
| Central African Republic | |
| Central America | |
| Ceylon | |
| Chad | |
| Chile (1810-1814) | |
| Chile (since 1817) | |
| China (Empire) | |
| China (Republic) | |
| China (Soviet Republic) | |
| China (Provisional Government) | |
| China (Nanjing) | |
| China (People's Republic) | |
| Cisalpine Republic | |
| Ciskei | |
| Cispadane Republic | |
| Cochin | |
| Cocos Islands | |
| Colombia | |
| Colorado | |
| Comoros | |
| Committee of Members of the Constituent Assembly | |
| Confederate States of America | |
| Congo (Brazzaville) | |
| Congo (Free State) | |
| Congo (Kinshasa) | |
| Connecticut | |
| Cook Islands | |
| Corrientes | |
| Corsica | |
| Costa Rica | |
| Côte d'Ivoire | |
| Courland | |
| Crete | |
| Crimean Khanate | |
| Croatia (1941-1945) | |
| Croatia (since 1991) | |
| Cuba (1868-1878) | |
| Cuba | |
| Cundinamarca | |
| Curaçao | |
| Cyprus | |
| Cyprus (Northern) | |
| Czech Republic | |
| Czechoslovakia |