Where is the 2009 dollar mint mark?

In 2009, the mint mark on U.S. coins is located on the reverse side of the coins for the quarter series, specifically near the bottom of the design. For the penny, the mint mark is found on the obverse side, just below the date. The mint marks indicate where the coin was produced, with "P" for Philadelphia, "D" for Denver, and "S" for San Francisco.