New York State Route 99 (NY 99) was a state highway in Franklin County. The western terminus of the route was at an intersection with NY 30 in Duane. Its eastern terminus was at a junction with NY 3 near the Franklin community of Merrillsville. The narrow, winding route passed through isolated and heavily wooded areas of Adirondack Park. NY 99 was known as the Port Kent–Hopkinton Turnpike and maintained by Franklin County as a county highway. The state highway had been co-designated, and is signed today solely as County Route 26 (CR 26).