New York State Route 3 (NY 3) is a major east–west state highway in New York, in the United States, that connects central New York to the North Country region near the Canada–US border via Adirondack Park. The route extends for between its western terminus at an intersection with NY 104A in the Cayuga County town of Sterling and its eastern terminus at a junction with U.S. Route 9 (US 9) in the Clinton County city of Plattsburgh. NY 3 traverses eight counties and is a lakeside roadway from Mexico to Sackets Harbor, a mountainous route in Adirondack Park, and an urban arterial in Fulton, Watertown, and Plattsburgh.