Westport is a town in Essex County, New York, United States overlooking Lake Champlain. The population was 1,312 at the 2010 census.The town is on the eastern border of the county and is 41 miles south of Plattsburgh and 103 miles south of Montreal, Quebec, Canada. Westport is inside the Adirondack Park.Westport is the birthplace of the Adirondack chair.The Essex County Fair is held in the town. The Essex County Fairgrounds was added to the National Register of Historic Places in 2005.