Of what coin.
If you have a Liberty Seated Dime, the "CC" mint mark will be on the reverse [tails] side of the coin at the bottom and can be either inside the wreath or just below it. If you have a Liberty Seated Quarter the "CC" mint mark will be on the reverse [tails] side of the coin at the bottom below the eagle. If you have a Liberty Seated Half Dollar the "CC" mint mark will be on the reverse [tails] side of the coin at the bottom below the eagle. If you have a Lbert Seated Silver Dollar the "CC" mint mark will be on the reverse [tails] side of the coin at the bottom below the eagle. If you have a Silver Trade Dollar the "CC" mint mark will be on the reverse [tails] side of the coin a the bottom just above the "D" in "DOLLAR" If you have a Morgan Silver Dollar the "CC" mint mark will be on the reverse [tails] side of the coin at the bottom below the wreath.
The mint mark is located on the reverse [tails] side of the coin at the bottom below the wreath. If there is no mint mark then the coin was minted at the Philadelphia Mint.
On the reverse side near the eagle's tail. Philadelphia issues do not have a mint mark, only Denver.
The mint mark on Franklin half dollars is on the reverse side, just above the Liberty Bell.
The mint mark on a Barber Half Dollar is located on the reverse side right under the tail of the eagle.
The mint mark on Washington quarters dated 1932-1964 is on the reverse (tails) side below the eagle.
The mint mark is on the reverse (tails) side, just below the eagle and above the the words ONE DOL. If there is no mint mark, it means the coin was minted in Philadelphia.
The mint mark on a $10 gold coin is located on the reverse below the eagle until 1907 when the design changed. The 1907 Indian Head type did not have a mint mark nor the motto "In God We Trust". In 1908 the Denver "D" mint mark was on the reverse side of the coin just above the tip of the branch on the left side of the design. The design was changed during production in 1908 and the motto "In God We Trust" was added and the mint mark moved to just left of the arrow points on the reverse side of the coin.
The mint mark on all Morgan Dollars is located on the reverse side of the coin just above the letters "DO" in the word "DOLLAR".
The mint mark, if the coin has one, is below the wreath on the reverse (1908-09 only).
On the 1979 quarter, the mint mark is located on the reverse side of the coin, just to the right of the eagle's tail. It can be either "D" for the Denver Mint or "P" for the Philadelphia Mint, though Philadelphia coins from that year typically do not have a mint mark. If there is no mint mark, it indicates the coin was minted in Philadelphia.
The mint mark is located on the eagle side of the coin and is between the word " fine " and the eagle.