Clarksville is a town located in Allegany County, New York, United States. As of the 2020 census, the town had a total population of 982. The town is named after S.N. Clark, an agent of the Holland Land Company.
The hamlet of Obi, as seen from New York State Route 305 in the town of Clarksville
New York State Route 305 (NY 305) is a north–south route in the Southern Tier that runs from the Pennsylvania state line in Cattaraugus County to the hamlet of Belfast in Allegany County, where it ends at NY 19. It intersects the Southern Tier Expressway in Cuba.
NY 305 approaching the Pennsylvania state line, where the road becomes PA 446