- Non-US citizens require a Travel Document for returning to US after travelling abroad. This can be obtained through form I-131.
- An unsigned photo(until asked to), US Passport application form DS-11
- Identity and Citizenship proof
- Two passport photos
- Passport application fee
- Social Security Number
Under the Western Hemisphere Travel Initiative US citizens traveling to Canada require to present either a WHTI-compliant document, or a government-issued photo ID, such as a driver’s license, plus proof of citizenship, such as a birth certificate as of Jan31 2008.
Other Accepted Travel Documents: SENTRI, NEXUS, FAST and the U.S. Coast Guard Mariner Document. Members of the U.S. Armed Forces on active duty traveling on orders are exempt from the passport requirement.