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is a village in Jefferson County, New York, United States. The population was 1,120 at the 2000 census. The name is derived from Dexter Borup, a local developer.
The village was formerly called "Fish Island," and was part of the lands belonging to Jacob and John Brown. The village was renamed "Dexter" after Dexter Borup.
Dexter became an incorporated village in 1855, with population of about 528.