Our offices are located at the US Embassy in El Salvador:

U.S.Commercial Service
Embassy of the United States of America
Boulevard y Urbanización Santa Elena
Antiguo Cuscatlán, El Salvador

If you are sending mail from the USA:

U.S. Embassy
Commercial Service
C/O Jennifer Gothard
Unit 3450
APO AA 34023

Ph.: (503) 2501-2999  x 3211
Fax: (503) 2501-3067

E-mail: san.salvador.office.box@mail.doc.gov