Saint Thomas is an island in the Caribbean Sea, 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 2001 census, the population of Saint Thomas was 51,181 about 47% of the US Virgin Islands total. The district has a land area of 80.9 km² (31.24 sq mi).

Saint Thomas is divided into the following subdistricts (with population as per the 2000 U.S. Census):

1. Charlotte Amalie (pop. 18,914)
2. Northside (pop. 8,712)
3. Tutu (pop. 8,197)
4. East End (pop. 7,672)
5. Southside (pop. 5,467)
6. West End (pop. 2,058)
7. Water Island (pop. 161)