U
- Ubangi-Shari (1915–1933)
- Uganda (1895–1902, 1962–)
- Ukraine (1918–1923, 1992–)
- Umm al Qiwain (1964–1969)
- Union of Soviet Socialist Republics (1922–1991)
- United Arab Emirates (1972–)
- United Kingdom (1840–)
- Northern Ireland (1958–)
- Scotland (1958–)
- Wales and Monmouthshire (1958–)
- British post offices in Africa (1942–1947)
- British post offices in China (1917–1922)
- British post offices in Morocco (1898–1956)
- British post offices in Tangier (1927–1957)
- British post offices in the Ottoman Empire (1885–1921)
- Guernsey (1957–)
- Alderney (1983–)
- Herm (1949–1971)
- Jersey (1957–)
- Lundy (1929–)
- Isle of Man (1957–)
- Calf of Man (1957–)
- United Nations (1951–)
- United States (1847–)
- Panama Canal Zone (1904–1978)
- Confederate States (1861–1863)
- Guam (1899)
- Hawaii (1851–1899)
- Upper Senegal and Niger (1906–1915)
- Upper Silesia (1920–1922)
- Upper Volta (1920–1980)
- Uruguay (1856–)
- Uzbekistan (1992–)
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