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West Leyden is a hamlet in Lewis County, New York, United States. The community is located in the town of Lewis along the East Branch of the Mohawk River at the intersection of New York State Route 26 and New York State Route 294, 6.6 miles (10.6 km) west-southwest of Boonville. West Leyden has a post office with ZIP code 13489, which opened on December 16, 1826.
Source: Wikipedia