What Are Mint Marks?
A mint mark is a small letter (or combination of letters) stamped on a coin to identify which United States Mint facility produced it. Since the opening of the first branch mints in 1838, mint marks have served as quality control identifiers, production records, and — for collectors — one of the most important factors in determining a coin's rarity and value. Two coins that are identical in date, denomination, and design can differ dramatically in value based solely on their mint mark, because mintages varied enormously between facilities.
Understanding mint marks is one of the first and most essential skills for any coin collector. A 1916 Mercury dime from Philadelphia (no mint mark, mintage 22 million) is worth $5–$10 in Good condition. The same coin from Denver (D mint mark, mintage 264,000) is worth $1,000+ in the same grade. The only visible difference: a tiny letter on the reverse of the coin.
US Mint Mark Guide
The following mint marks have been used on US coins throughout history:
- No mint mark (blank) — Philadelphia, 1793–1979. For most of US coinage history, Philadelphia coins bore no mint mark; the absence of a mark was itself the identifier. This is still true for Lincoln cents.
- P — Philadelphia, 1942–1945 (wartime nickels only) and 1980–present (all denominations except cents). The "P" was first used on wartime Jefferson nickels containing 35% silver, then adopted permanently starting in 1980.
- D — Dahlonega, Georgia (1838–1861) for gold coins only; Denver, Colorado (1906–present) for all denominations. Context (the coin's date) determines which mint. Pre-Civil War gold with "D" = Dahlonega; 1906 and later = Denver.
- S — San Francisco (1854–1955 for circulation strikes; 1968–present primarily for proof coins and special issues).
- O — New Orleans (1838–1909). Used on both gold and silver coins during two operational periods separated by the Civil War.
- C — Charlotte, North Carolina (1838–1861). Used exclusively on gold coins. All "C" mint coins are scarce and collectible.
- CC — Carson City, Nevada (1870–1893). The most sought-after mint mark among collectors. Used on silver and gold denominations. Even common CC dates command significant premiums.
- W — West Point, New York (1984–present). Used primarily on commemorative coins, proof precious metal coins, and selected special issues. Bullion-strike American Eagles from West Point carry no mint mark.
Where to Find Mint Marks on Coins
Mint mark placement has changed throughout US coinage history, and knowing where to look is essential for proper identification:
- Early US coins (1793–1837) — No mint marks (all produced at Philadelphia).
- 19th-century coins (1838–1916) — Mint marks typically appear on the reverse, often near the denomination or below the eagle/wreath.
- Early 20th century (1916–1964) — Placement varies by denomination. Mercury dimes: reverse, left of fasces. Walking Liberty halves: obverse (1916–1917) then reverse. Lincoln cents: obverse, below date. Buffalo nickels: reverse, below "FIVE CENTS."
- Modern coinage (1965–present) — After 1968, mint marks were moved to the obverse on most denominations. On modern coins, look on the obverse near the date or below "IN GOD WE TRUST." Washington quarters: obverse, right of Washington's ponytail. Lincoln cents: obverse, below date. Roosevelt dimes: obverse, above date.
A 10x loupe is essential for reading mint marks on many older coins, where the marks are small and may be weakly struck. At coin shows, always examine mint marks carefully before purchasing — misidentified mint marks are a common source of overpayment.
How Mint Marks Affect Value
Mint marks affect value because they identify the specific production facility and, by extension, the mintage (number of coins produced). Lower-mintage coins from smaller mints are scarcer, and scarcity drives price. Some examples of dramatic mint-mark value differences:
- 1893 Morgan dollar — Philadelphia (no mm): $50 in VG. San Francisco (S): $2,000 in VG. New Orleans (O): $100 in VG. Carson City (CC): $200 in VG.
- 1916 Mercury dime — Philadelphia: $8 in G. San Francisco: $8 in G. Denver: $1,200 in G.
- 1932 Washington quarter — Philadelphia: $10 in VG. Denver: $150 in VG. San Francisco: $150 in VG.
These differences make mint mark identification one of the most financially consequential skills in coin collecting. A collector who doesn't check mint marks is, literally, leaving money on the table.
Repunched Mint Marks (RPMs)
Before 1990, mint marks were punched by hand into individual working dies using a small steel punch. This manual process occasionally produced errors called repunched mint marks (RPMs), where the punch was applied more than once at slightly different positions, leaving a doubled or shifted mint mark. RPMs are a popular variety collecting specialty, with some commanding significant premiums. The PCGS and NGC variety attribution services catalog hundreds of recognized RPMs across many series.
Up Next
Major Coinage Acts — the legislation that shaped American money from 1792 to the present.
This guide is for educational purposes. Where official standards, grading services, organization memberships, or legal requirements apply, consult the primary authority named in the references below or the relevant government agency.
Reviewed on March 8, 2026 by the US Coin Shows editorial team. Editorial policy
Frequently Asked Questions
What do coin mint marks mean?
A mint mark indicates which US Mint facility produced the coin. P=Philadelphia, D=Denver, S=San Francisco, W=West Point, CC=Carson City, O=New Orleans, C=Charlotte. The same date from different mints can have very different values.
Apply what you've learned