What is the smallest denomination of US paper currency in circulation?

The smallest denomination of US paper currency in circulation is the one-dollar bill.

The $1 note has been the lowest-value US paper denomination since fractional currency notes were discontinued in 1876. Modern small-size dollar bills began with Series 1928 issues, while today’s Federal Reserve Note design features George Washington on the front and the Great Seal of the United States on the back.

The $2 bill is also still an official circulating denomination, but its higher face value and relative rarity often cause confusion. Likewise, coins such as the dime and penny represent smaller monetary values, but they are not paper currency. The one-dollar bill remains widely used for everyday purchases, tipping, cash transactions and making change.

Unlike higher denominations, the $1 note has not received a major modern redesign because officials have generally found its existing design sufficiently recognizable and secure. Its familiar green appearance has also helped make “greenback” a common nickname for US paper money.