word | | Country name |
| form | Comoros | conventional long form: Union of the Comoros conventional short form: Comoros local long form: Udzima wa Komori (Comorian); Union des Comores (French); Jumhuriyat al Qamar al Muttahidah (Arabic) local short form: Komori ... |
| form | Congo, Democratic Republic of the | conventional long form: Democratic Republic of the Congo conventional short form: DRC local long form: Republique Democratique du Congo local short form: RDC former: Congo Free State, Belgian Congo, Congo/Leopoldville, Congo ... |
| form | Congo, Republic of the | conventional long form: Republic of the Congo conventional short form: Congo (Brazzaville) local long form: Republique du Congo local short form: none former: Middle Congo, Congo/Brazzaville, Congo |
| form | Cook Islands | conventional long form: none conventional short form: Cook Islands former: Harvey Islands |
| form | Coral Sea Islands | conventional long form: Coral Sea Islands Territory conventional short form: Coral Sea Islands |
| form | Costa Rica | conventional long form: Republic of Costa Rica conventional short form: Costa Rica local long form: Republica de Costa Rica local short form: Costa Rica |
| form | Cote d'Ivoire | conventional long form: Republic of Cote d'Ivoire conventional short form: Cote d'Ivoire local long form: Republique de Cote d'Ivoire local short form: Cote d'Ivoire note: pronounced coat-div ... |
| form | Croatia | conventional long form: Republic of Croatia conventional short form: Croatia local long form: Republika Hrvatska local short form: Hrvatska former: People's Republic of Croatia, Socialist Republic of Croatia |
| form | Cuba | conventional long form: Republic of Cuba conventional short form: Cuba local long form: Republica de Cuba local short form: Cuba |