Here are the required documents for an American citizen to obtain a passport in the UK ¹:
- Confirmation page of the application form DS-160
- One 5 x 5 cm (2” by 2”) color photograph taken within the last six months
- Appointment confirmation page
- Passport or travel document
- Evidence of your status in the United Kingdom (if you are not a U.K or EU passport holder)
- Evidence of previously issued U.S. visas (if applicable)
- Medical certificate (if you have any medical conditions)
