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is a town located in Steuben County, New York. As of the 2000 census, the town had a total population of 1,270. The name is that of a military hero at Fort Moultrie, William Jasper.
is in the southwest part of the county, west of Corning, NY. .
The first settlers arrived around 1807.
The town was formed in 1837 from parts of the Towns of Troupsburg and Canisteo, but yielded territory to form part of the Town of Greenwood in 1848.