NY 180 begins at an intersection with NY 3 in the Hounsfield hamlet of Baggs Corner. A state-maintained continuation of County Route 66 (CR 66), NY 180 runs northeast through the wide fields of Hounsfield, passing east of the Black River Bay, and after bending north, the route passes west of Watertown International Airport. NY 180 soon meets at a junction with NY 12F, which runs east past the entrance of the airport. Crossing over the Black River, the route enters the village of Dexter. Now known as Brown Street, NY 180 runs north through the center of the village, reaching a junction with Grove Street, marking the northern edge of the village.