* D quarters are minted at the Denver Mint in Denver, Colorado.
* P quarters are minted at the Philadelphia Mint in Philadelphia, Pennsylvania.
There is no difference in value between D quarters and P quarters. Both coins are worth 25 cents.
In addition to the mint mark, D quarters and P quarters can also be distinguished by their design. The obverse of both coins features a portrait of George Washington, but the reverse designs are different. The reverse of the D quarter features a mountain scene with a pine tree in the foreground, while the reverse of the P quarter features an eagle with a shield.
The mint marks on D quarters and P quarters are used to track the production of the coins and to identify the mint where they were produced. This information can be helpful to coin collectors and historians.