New York State Route 420
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New York State Route 420 is a state highway located in the northern part of New York, USA. This highway is a north-south route located entirely within St. Lawrence County, linking the Towns of Massena and Stockholm.
The northern terminus of NY-421 is at New York State Route 37B in the Village of Massena near the Grasse River. The southern terminus is at US Route near the community of East Part by the St. Regis River.
