Where Is a Mint Mark on a Nickel?

By GovMint :

In 1938 the Jefferson Nickel was introduced. The mint mark on the nickel composition coins from 1938 until 1964 appeared immediately to the right of Monticello, near the rim on the reverse of the coin. In 1968 the mint mark was placed on the obverse of the coin. The identifying mark appears near the edge of the coin, below the date, near the ribbon tying Mr. Jefferson’s braid. 

There are three different Jefferson Nickel obverse designs that one is likely to find in circulation. After 1968, the mint mark could be described as located on the obverse, lower right of the design near the date.

This piece wasn’t until 1942 that the “P” mint mark made its initial appearance on the popular Jefferson War Nickels. These coins were struck from 1942 through 1945. The first-ever P mint mark in the history of U.S. coinage appeared on the reverse of these popular coins above Monticello. It would not be until 1980 that the P mint mark would return to the nickel series.

Sources Used:

https://www.usmint.gov/learn/history/overview

https://www.usmint.gov/about/mint-tours-facilities/philadelphia

https://www.usmint.gov/about/mint-tours-facilities/san-francisco

https://www.usmint.gov/about/mint-tours-facilities/denver

https://www.usmint.gov/about/mint-tours-facilities/west-point