The U.S. Treasury is responsible for the printing, but it is the Federal Reserve System, or Fed, that is actually authorized by the U.S. government to issue dollars.
The Federal Reserve Banks in each of its 12 Federal Reserve Districts issue the dollar bills and circulate them in the market through large financial institutions or banks.
Dollar bills are printed exclusively by the U.S. Bureau of Engraving and Printing, the security printing arm of the U.S. government, which operates two printing plants in Washington and Fort Worth, Texas.
Its mission is to design and produce high quality and safe products according to customer requirements for quality, quantity and level of security against counterfeiting.
The Bureau of Engraving and Printing is the Department of the Treasury, so if the Treasury seal and the Secretary of the Treasury’s signature are printed on the front of the bill, the Treasury is responsible for the printing of the United States.