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Thousand Island Park, also known as TI Park, is a hamlet and census-designated place (CDP) in the town of Orleans, Jefferson County, New York, United States, in the Thousand Islands region on the St. Lawrence River. Founded in 1875 as a holiday camp, the incorporated community remains a seasonal summer community; despite 323 housing units, there was only a population of 31 permanent residents as of the 2010 census.The community is a national historic district, listed on the National Register of Historic Places in 1982. The district is notable for its outstanding concentration of substantially-intact late 19th-century and early 20th-century resort architecture. The park also contains Vivekananda Cottage, a Hindu sacred site visited by the Swami Vivekananda and his followers.