text: Current U.S. assay offices include the following:
  * The Philadelphia Mint – 1792 to date
  * The Denver Mint – 1862 to date. It served as an assay office until 1906, when coinage operations began.
  * The San Francisco Mint – 1852 to date. Coinage operations were suspended in March 1955, but the plant continued to operate as an assay office. In 1962, its official designation was changed from mint to assay office. Coinage operations were again authorized in 1965.
  * The West Point, New York Bullion Depository – 1938 to date. It is operated as an adjunct of the New York Assay Office.