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Castletown is a town in the Isle of Man. It is the former capital of the island. Notable buildings in the town include Castle Rushen and the Old House of Keys. Tynwald used to meet in Castletown except on Tynwald Day, when it traditionally met (and still meets) on Tynwald Hill in St John's. Castletown's population is 3,100 (according to the 2001 census).