<Tr> <Th> Pop . density </Th> <Td> 638.17 / km (1,652.85 / sq mi) </Td> </Tr> <Tr> <Th> Ethnic groups </Th> <Td> Afro - Caribbean, Hispanic, Caucasian </Td> </Tr> <P> Saint Thomas (Danish: Sankt Thomas) is one of the Virgin Islands in the Caribbean Sea and, together with Saint John, Water Island and Saint Croix, a former Danish colony, form a county and constituent district of the United States Virgin Islands (USVI), an unincorporated territory of the United States . Located on the island is the territorial capital and port of Charlotte Amalie . As of the 2010 census, the population of Saint Thomas was 51,634 about 48.5% of the US Virgin Islands total . The district has a land area of 32 square miles (83 km). </P> <P> The island was originally settled around 1500 BC by the Ciboney people . They were later replaced by the Arawaks and then the Caribs . Christopher Columbus sighted the island in 1493 on his second voyage to the "New World". </P>

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