C
- Cambodia (1951–)
- Cameroon (1897–)
- Cameroons (1960-1960)
- Canada (1851–)
- Canadian provinces (1850–1947)
- British Columbia and Vancouver Island (1860)
- New Brunswick (1851–1860)
- Newfoundland (1850–1947)
- Nova Scotia (1851–1860)
- Prince Edward Island (1861–1872)
- Cape Juby (1916–1948)
- Cape of Good Hope (1853–1904)
- Mafeking Siege (1900)
- Cape Verde (1877–)
- Castellorizo (1920–1932)
- Cayman Islands (1900–)
- Central African Republic (1959–)
- Central Lithuania (1919–1922)
- Ceylon (1857–1972)
- Chad (1922–)
- Chechnya (1992)
- Chile (1853–)
- China before division (1878–1949)
- People's Republic of China (1949–)
- Republic of China (1950–)
- Christmas Island (1958–)
- Cilicia (1919–1920)
- Cocos Islands (1963–)
- Colombia (1859–)
- Antioquia (1868–1902)
- Bolívar (1863–1885)
- Boyacá (1902–1904)
- Comoros (1950–)
- Democratic Republic of the Congo (1960–)
- Republic of the Congo (1959–)
- Cook Islands (1892–)
- Corfu (1923–1941)
- Costa Rica (1863–)
- Cote d'Ivoire (1892–)
- Crete (1898–1910)
- Croatia (1941–1945, 1991–)
- Cuba (1855–)
- Cyprus (1880–)
- Cyrenaica (1923–1950)
- Czechoslovakia (1918–1992)
- Bohemia and Moravia (1939–1944)
- Czech Republic (1993–)
Read more about this topic: List Of People On Stamps