U.S currency is produced by the Bureau of Engraving and Printing and U.S. coins are produced by the U.S. Mint. Both organizations are bureaus of the U.S. Department of the Treasury.
Bureau of Engraving and Printing
Report Counterfeit Currency
Report suspected counterfeit notes to your local police department or the local U.S. Secret Service office.
UScurrency.gov
UScurrency.gov is managed by the U.S. Currency Education Program (CEP), of the Federal Reserve Board. CEP works closely with the Bureau of Engraving and Printing and the U.S. Secret Service to raise awareness about how to use the design and security features of U.S. currency.
U.S Mint