| Prio | Original string | Translation | — |
|---|---|---|---|
| Christmas Island | Joulusaari | Details | |
| Cocos [Keeling] Islands | Kookossaaret | Details | |
| Colombia | Kolumbia | Details | |
| Comoros | Komorit | Details | |
| Congo - Brazzaville | Kongo - Brazzaville | Details | |
| Congo - Kinshasa | Kongo - Kinshasa | Details | |
| Cook Islands | Cookinsaaret | Details | |
| Costa Rica | Costa Rica | Details | |
| Croatia | Kroatia | Details | |
| Cuba | Kuuba | Details | |
| Cyprus | Kypros | Details | |
| Czech Republic | Tšekin tasavalta | Details | |
| Côte d’Ivoire | Norsunluurannikko | Details | |
| Denmark | Tanska | Details | |
| Djibouti | Djibouti | Details | |
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