The remainder of NY 37's old routing through Massena became an extension of NY 37B, which continued west through the town of Louisville on Town Line Road and an unnamed roadway along the St. Lawrence River to NY 37 at Louisville Corner.
The remaining portion of NY 37's old route in Massena became part of NY 37B, which then continued west through Louisville on Town Line Road and an unnamed roadway along the St. Lawrence River to connect back with NY 37 at Louisville Corner.