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| Name | Entry in The World Factbook | |
| Cape Town [US Consulate General] | South Africa | |
| Caracas [US Embassy] | Venezeula | |
| Cargados Carajos Shoals | Mauritius | |
| Caroline Islands | Micronesia, Federated States of; Pacific Islands, Trust Territory of the | |
| Caribbean Sea | Atlantic Ocean | |
| Carpentaria, Gulf of | Pacific Ocean | |
| Casablanca [US Consulate General] | Morocco | |
| Cato Island | Australia | |
| Cebu [US Consulate] | Philippines | |
| Celebes | Indonesia | |
| Celebes Sea | Pacific Ocean | |
| Celtic Sea | Atlantic Ocean | |
| Central African Empire | Central African Republic | |
| Ceuta | Spain | |
| Ceylon | Sri Lanka | |
| Chafarinas, Islas | Spain | |
| Chagos Archipelago (Oil Islands) | British Indian Ocean Territory | |
| Channel Islands | Guernsey; Jersey | |
| Chatham Islands | New Zealand | |
| Cheju-do | Korea, South | |
| Cheju Strait | Pacific Ocean | |
| Chengdu [US Consulate General] | China | |
| Chesterfield Islands (Îles Chesterfield) | New Caledonia | |
| Chiang Mai [US Consulate General] | Thailand | |
| Chihli, Gulf of (Bo Hai) | Pacific Ocean | |
| China, People's Republic of | China | |
| China, Republic of | Taiwan | |
| Choiseul | Solomon Islands | |
| Christchurch [US Consular Agency] | New Zealand | |
| Christmas Island [Indian Ocean] | Australia | |
| Christmas Island [Pacific Ocean] (Kiritimati) | Kiribati | |
| A|rctic Ocean | ||
| Ciskei | South Africa | |
| Ciudad Juarez [US Consulate General] | Mexico | |
| Cochabamba [US Consular Agency] | Bolivia | |
| Coco, Isla del | Costa Rica | |
| Cocos Islands | Cocos (Keeling) Islands | |
| Colombo [US Embassy] | Sri Lanka | |
| Colon [US Consular Agency] | Panama | |
| Colon, Archipielago de (Galapagos Islands) | Ecuador | |
| Commander Islands (Komandorskiye Ostrova) | Soviet Union | |
| Conakry [US Embassy] | Guinea | |
| Congo (Brazzaville) | Congo | |
| Congo (Kinshasa) | Zaire | |
| Congo (Leopoldville) | Zaire | |
| Con Son Islands | Vietnam | |
| Cook Strait | Pacific Ocean | |
| Copenhagen [US Embassy] | Denmark | |
| Coral Sea | Pacific Ocean | |
| Corn Islands (Islas del Maíz) | Nicaragua | |
| Corsica | France | |
| Cosmoledo Group | Seychelles | |
| Côte d'Ivoire | Ivory Coast | |
| Cotonou [US Embassy] | Benin | |
| Crete | Greece | |
| Atlantic Ocean | ||
| Crozet Islands (Îles Crozet) | French Southern and Antarctic Lands | |
| Curaçao [US Consulate General] | Netherlands Antilles | |
| Cusco [US Consular Agency] | Peru | |
| D | Dahomey | Benin |
| Daitō Islands | Japan |
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