| Prio | Original string | Translation | — |
|---|---|---|---|
| Christmas Island | Wyspa Bożego Narodzenia | Details | |
| Cocos [Keeling] Islands | Wyspy Kokosowe | Details | |
| Colombia | Kolumbia | Details | |
| Comoros | Komory | Details | |
| Congo - Brazzaville | Kongo - Brazzaville | Details | |
| Congo - Kinshasa | Kongo - Kinszasa | Details | |
| Cook Islands | Wyspy Cooka | Details | |
| Costa Rica | Kostaryka | Details | |
| Croatia | Chorwacja | Details | |
| Cuba | Kuba | Details | |
| Cyprus | Cypr | Details | |
| Czech Republic | Republika Czeska | Details | |
| Côte d’Ivoire | Wybrzeże Kości Słoniowej | Details | |
| Denmark | Dania | Details | |
| Djibouti | Dżibuti | Details | |
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