Henderson is a town in Jefferson County, New York, United States. The population was 1,360 at the 2010 census. The town is named after William Henderson, the original European-American land owner. Henderson is in the western part of the county and is southwest of Watertown. The Great Lakes Seaway Trail runs through the town along New York State Ro…Henderson is a town in Jefferson County, New York, United States. The population was 1,360 at the 2010 census. The town is named after William Henderson, the original European-American land owner. Henderson is in the western part of the county and is southwest of Watertown. The Great Lakes Seaway Trail runs through the town along New York State Route 3 and includes a monument to its founder, William E. Tyson.
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