If you are in Greece you are required to apply for the passport service at the U.S. Embassy in Athens. Do not send your application to the Passport Agency in the United States.
Please send your application, passport and required documents to:
Passport & Citizenship Unit
91 Vasilissis Sofias Avenue
101 60 Athens.
We suggest that you use Registered Mail or a Courier Service so that you can trace the shipment of your envelope.