What mint marks are used on US coins?
The following mint marks have been used on US coins since the practice was first adopted in 1838:None: Philadelphia1793-present for cents; 1794-1978 for dollars, 1866-1942 and 1945-present for nickels, up to 1979 for all other denominationsP: Philadelphia1942-45 nickels, 1979-present for dollars, 1980-present for all other denominations except cents,D: DenverSince 1906S: San Francisco1854-1861, 1870-1955; some cents and nickels 1968-74; proof coins since 1968W: West Point1988-present; commemorative coins onlyNote that San Francisco and West Point occasionally produce additional cents without mint marks when demand is high.The following Mints are no longer in operation:C: Charlotte1838-1861; gold coins onlyD: Dahlonega GA1838-1861; gold coins onlyO: New Orleans:1838-1861 and 1879-1909CC: Carson City:1870-1884 and 1890-1893