In the absence of diplomatic or consular relations of the United States of America with the Islamic Republic of Iran, the Swiss government, acting through its Embassy in Tehran, serves as the Protecting Power of the USA in Iran since 21 May 1980. The Swiss Embassy's Foreign Interests Section provides consular services to U.S. citizens living in or travelling to Iran. Please note that the U.S. government warns that U.S. citizens should not travel to Iran for any reason.
Smart Traveler Enrollment Program
The Smart Traveler Enrollment Program (STEP) is a free service to allow U.S. citizens and nationals to enroll their trip abroad so the U.S. Department of State can accurately and quickly contact them in case of emergency. U.S. citizens in Iran are strongly encouraged to enroll in STEP.