US citizens are required a valid visa to visit Vietnam, visa can be applied by person through the Embassy of Vietnam below.
Embassy of Vietnam in Washington DC., USA
1233, 20th St., NW, Suite 400 Washington DC 20036 USA
Phone: +1-202-861 2293 (Consular)
Fax: +1-202-861 0694 (Consular)
Website URL: www.vietnamembassy-usa.org