The U.S. Embassy is situated in Sofia. The mission of the United States Embassy is to advance the interests of the United States, and to serve and protect U.S. citizens in Bulgaria. It works to develop and sustain the important relationship between Bulgaria and the USA, and provide consular assistance to U.S. nationals and Bulgarian citizens.
In the U.S. Embassy travelers, who wish to work, study or live in the United States, can: apply for and renew passports and other official documents, apply for different kinds of visas (non-immigrant visas: K-1 fiancee visa, F-1 student visa, B-1 business visa, J-1 exchange visa etc., and immigrant visas: green card), renew visas etc.
Here is the contact information of the U.S. Embassy in Bulgaria:
U.S. Embassy in Sofia
16, Kozyak Street
(+359 2) 937 5100
Information for the U.S. nationals traveling to Bulgaria:
The U.S. Embassy is responsible for its own fellow U.S. citizens, living or travelling in the host country. The U.S. nationals can get non-emergency services (e.g. renewal of U.S. passports, Consular Reports of Birth Abroad etc.) and emergency services (e.g. death, arrest, illness, abduction in process etc.), schedule the appointment or go in person at the U.S. Embassy in Sofia. Visitors can also receive help with social security, notary services and other issues.