Most adult U.S. citizens in Germany who need to renew their passport have the option to submit their application either by mail OR by using the walk-in hours in Frankfurt or Munich, without an appointment.
Adult Renewal options:
Children (aged 16 or younger) and adults who are applying for their first U.S. passport must make an appointment and appear in-person at the U.S. Embassy/Consulate in Munich, Berlin, or Frankfurt, using the longer DS-11 application form.
For Children (16 and younger): Please follow these instructions to prepare your application and make an appointment.
For Adults (17 and up): Please follow these instructions to prepare your application and make an appointment.
NOTE: When applying for a U.S. passport in Germany, some of the instructions differ slightly from the information presented as part of the “Wizard” on the previous page. Where there are differences, the information on this page(and the pages linked from here) is correct and definitive.