 The route serves as the major road in the area of the Adirondacks for most of its length, and as a major arterial in Plattsburgh.NY 374 was assigned in the 1930 state route renumbering from NY 3 in Cadyville to the state line.It was extended eastward to NY 22 in Plattsburgh in the 1970s following the completion of an arterial bypassing northern Plattsburgh.