In Massena, the forests along NY 420 subside slightly as it passes by industrial warehouses and residences. The route curves back to the northwest as it enters the village of Massena. Just past the village line, NY 420 crosses the St. Lawrence Subdivision, a railroad line owned by CSX Transportation. The highway continues on, curving northward to cross the Raquette River. It curves back to the northwest on the northern riverbank and passes by a mixture of homes and commercial establishments before intersecting NY 37 south of the village center. NY 420 ends here; however, the road continues north into the heart of the village as Main Street.