| Cabo Verde | +238 |
| Cambodge | +855 |
| Cameroun | +237 |
| Canada | +1 |
| Îles Caïmans | +1345 |
| République centrafricaine | +236 |
| Tchad | +235 |
| Chili | +56 |
| Chili | +56 |
| Chine | +86 |
| Îles Christmas | +672 |
| Îles Christmas | +61 |
| Îles Cocos | +61 |
| Îles Cocos | +672 |
| Colombie | +57 |
| Comores | +269 |
| Îles Cook | +682 |
| Costa Rica | +506 |
| Croatie | +385 |
| Cuba | +53 |
| Curaçao | +5999 |
| Chypre | +357 |
| Chypre | +90 |
| Czechia | +420 |
| Czechia | +42 |