Whether you need a passport as a U.S. citizen to travel to or from a U.S. territory or Freely Associated State depends on your destination. U.S. citizens do not need a passport to travel between the U.S. and these territories: Guam  Commonwealth of the Northern Mariana Islands Puerto Rico U.S. Virgin Islands While American Samoa is a U.S. territory, you do need a passport or a certified U.S. birth certificate to enter the island. U.S. citizens do need a passport to travel to these Freely Associated States: The Federated States of Micronesia The Republic of the Marshall Islands The Republic of Palau