The Bureau of Engraving shows examples of large denomination U.S. currency.

"On July 14, 1969, the Department of the Treasury and the Federal Reserve System announced that currency notes in denominations of $500, $1,000, $5,000, and $10,000 would be discontinued immediately due to lack of use. Although they were issued until 1969, they were last printed in 1945. These notes are legal tender and may be found in circulation today; however, most notes still in circulation are probably in the hands of private numismatic dealers and collectors."