Saint John is one of the Virgin Islands in the Caribbean Sea and a constituent district of the United States Virgin Islands, an unincorporated territory of the United States.
Saint John is the smallest of the three main US Virgin Islands. It is located about four miles east of Saint Thomas, the location of the territory's capital, Charlotte Amalie. It is also four miles southwest of Tortola, part of the British Virgin Islands. Its largest settlement is Cruz Bay with a population of 2,700. Saint John's nickname is Love City.
Since 1956, approximately 60% of the island is protected as Virgin Islands National Park, administered by the United States National Park Service. The economy is based predominantly on tourism and related trade.
Saint John is 50.8 km² in area with a population of 4,170. As of the 2010 U.S. Census, the total population of the US Virgin Islands territory was 106,405, comprising mostly persons of Afro-Caribbean descent.