The first set of posted routes in New York were assigned in 1924. In the vicinity of Corning, Route 4 became part of NY 17 while the portion of Route 14 from Painted Post to Cohocton was designated as part of NY 4, which also extended south to the Pennsylvania state line and north to Rochester via Wayland, Springwater, East Avon, and Henrietta. NY 4 was renumbered to NY 2 in 1927 to eliminate the numerical duplication between NY 4 and the new US 4 in eastern New York. Both NY 2 and NY 17 remained unchanged until 1938, when US 15 was extended northward from Harrisburg, Pennsylvania, to Rochester along the routing of NY 2. NY 17 and US 15 were rerouted slightly in the late 1950s to follow Coopers–Bath Road through Painted Post instead.