The Mint Mark denotes where the coin was made. Certain mints (the places where they were made) made fewer coins than others and thus they can be worth more because they are harder to find. This varies from denomination to denomination and year to year. Current mint marks on U.S. coins include
- "P" - Philadelphia (dollars since 1979; other denominations except cents since 1980, and nickels from 1942 to 1945)
- "D" - Denver (since 1906)
- "S" - San Francisco (till 1954 on all denominations, some circulating dates since then, and all proof coins since 1968)
- "W" - West Point (commemorative coins only)
Older mint marks:
- "O" - New Orleans (up to 1909)
- "CC" - Carson City (1870-1893)
- "C" - Charlotte ((gold coins only, 1838-1861)
- "D" - Dahlonega, GA (gold coins only, 1838-1861)
