Which denomination of U.S. currency has the greatest number of bills currently in circulation?

Benjamin Franklin tops the list of circulating U.S. banknotes, even if your wallet suggests otherwise. The $100 bill is now the most widely circulated bill with nearly 20 billion notes in existence—more than any other denomination. While the $1 bill remains the workhorse of everyday cash transactions, demand for $100 bills has soared because they are widely used as a store of value in the United States and around the world. In fact, most $100 bills are estimated to circulate outside the U.S., where they are held as savings or used in international commerce.