51st state
Guam (formally the Territory of Guam) is an unincorporated and organized territory of the United States. Located in the western Pacific Ocean, Guam is one of five American territories with an established civilian government.
Unincorporated territories of the United States
Of the 13 territories, five are inhabited. These are either organized or self-governing, but unincorporated. These are Puerto Rico, Guam, Northern Mariana Islands, U.S. Virgin Islands, and American Samoa. There are also nine uninhabited U.S. possessions, of which only Palmyra Atoll is incorporated. (See Territories of the United States, Unorganized territory and insular area.)