Our office is located at the U.S. Embassy in El Salvador:

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

If you are sending mail from the United States:

AmEmbassy San Salvador
ATTN: U.S. Commercial Service
3450 San Salvador Place
Washington DC 20521-3450
Ph.: (503) 2501-3211
Fax: (503) 2501-3067
E-mail: office.sansalvador@trade.gov