Vanceboro is a town in Washington County, Maine, United States. The town was named after landowner William Vance. The main village in town is located at the eastern terminus of Maine State Route 6. Vanceboro is across the St. Croix River from St. Croix, New Brunswick, Canada, to which it is connected by the Saint Croix–Vanceboro Bridge. Vanceboro is also connected to St. Croix by the Saint Croix–Vanceboro Railway Bridge, which is used by the New Brunswick Southern Railway.