Thornwood is a hamlet, census-designated place, and postal designation in the town of Mount Pleasant in Westchester County, New York, United States. The population was 3,759 at the 2010 census. In 1891, Lewis Smadback started a very successful development at what is now Thornwood. The village of Sherman Park was incorporated in 1906 a…Thornwood is a hamlet, census-designated place, and postal designation in the town of Mount Pleasant in Westchester County, New York, United States. The population was 3,759 at the 2010 census. In 1891, Lewis Smadback started a very successful development at what is now Thornwood. The village of Sherman Park was incorporated in 1906 and the name was changed to Hillside in 1909. The village was dissolved in 1914, when Thornwood took its current name and became a hamlet within the Town of Mount Pleasant. It is possible that Thornwood is a derivative of "Hawthorne's Woods," since Hawthorne is an adjacent hamlet. Another possibility is Thornwood is named after an area in Glasgow, Scotland.
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