word | | Country name |
| conventional | China | conventional long form: People's Republic of China conventional short form: China local long form: Zhonghua Renmin Gongheguo local short form: Zhongguo abbreviation: PRC |
| conventional | Christmas Island | conventional long form: Territory of Christmas Island conventional short form: Christmas Island |
| conventional | Clipperton Island | conventional long form: none conventional short form: Clipperton Island local long form: none local short form: Ile Clipperton former: sometimes called Ile de la Passion |
| conventional | Cocos (Keeling) Islands | conventional long form: Territory of Cocos (Keeling) Islands conventional short form: Cocos (Keeling) Islands |
| conventional | Colombia | conventional long form: Republic of Colombia conventional short form: Colombia local long form: Republica de Colombia local short form: Colombia |
| conventional | 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 ... |
| conventional | 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 ... |
| conventional | 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 |
| conventional | Cook Islands | conventional long form: none conventional short form: Cook Islands former: Harvey Islands |
| conventional | Coral Sea Islands | conventional long form: Coral Sea Islands Territory conventional short form: Coral Sea Islands |
| conventional | 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 |