- Cambodia
- Cameroon
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- Central African Republic
- Central African States
- Ceylon
- Chad
- Chile
- China
- China, People's Republic
- Cocos (Keeling) Islands
- Colombia
- Comoros
- Confederate States of America
- Congo
- Congo Democratic Republic
- Cook Islands
- Costa Rica
- Croatia
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- Curacao
- Cyprus
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- Southern Rhodesia
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- Spitzbergen
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- St. Helena
- St. Kitts & Nevis
- St. Pierre & Miquelon
- St. Thomas & Prince
- St. Vincent
- Straits Settlements
- Sudan
- Suriname
- Svalbard (Spitzbergen)
- Swaziland
- Sweden
- Switzerland
- Syria
