<Tr> <Th> Pop . density </Th> <Td> 892 / km (2,310 / sq mi) </Td> </Tr> <Tr> <Th> Ethnic groups </Th> <Td> Afro - Caribbean, White, Chinese, East Indian, and mixed </Td> </Tr> <P> Saint Martin (French: Saint - Martin; Dutch: Sint Maarten) is an island in the northeast Caribbean Sea, approximately 300 km (190 mi) east of Puerto Rico . The 87 - square - kilometre (34 sq mi) island is divided roughly 60 / 40 between the French Republic (53 km, 20 sq mi) and the Kingdom of the Netherlands (34 km, 13 sq mi), but the two parts are roughly equal in population . It is the world's smallest inhabited island divided between two nations . The division dates to 1648 . The southern Dutch part comprises Sint Maarten and is one of four constituent countries that form the Kingdom of the Netherlands . The northern French part comprises the Collectivité de Saint - Martin (Collectivity of St Martin) and is an overseas collectivity of France . </P> <P> On 1 January 2009, the population of the whole island was 77,741 inhabitants, with 40,917 living on the Dutch side, and 36,824 on the French side . </P>

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