What is the Longest-Running Coin in United States History?

By GovMint :

The title of the longest-running coin in United States history proudly goes to the Lincoln Cent. First introduced in 1909, this coin has been in continuous production for over a century, marking it as an enduring piece of American numismatics. The Lincoln Cent was minted initially to commemorate the 100th anniversary of President Abraham Lincoln's birth in 1909 and featured his profile on the obverse. Over the years, the reverse side has seen different designs, including the original wheat ear reverse, Lincoln Memorial reverse and, more recently, new reverse designs commemorating the bicentennial of Lincoln's birth in 2009. Despite these changes, the Lincoln Cent's presence in American pockets, piggy banks, and collections has remained constant, making it a staple of U.S. coinage with a rich history.

Sources: 

https://www.thecaucusblog.com/2020/08/a-one-cent-symbol-of-single-and-united.html