The United States released a fact sheet "Transparency in the U.S. Nuclear Weapons Stockpile" (local copy). According to the document, "as of September 2013, the U.S. stockpile of nuclear warheads consisted of 4,804 warheads." Additional "several thousand" nuclear weapons are retired and awaiting dismantlement.

The report is an update of the information released in May 2010 that reflected the status of the U.S. weapon stockpile as of September 2009.