Prescott is a town on the north shore of the Saint Lawrence River in province of Ontario, Canada. The town is a part of the United Counties of Leeds and Grenville. In 2021, it had a population of 4,078. The Ogdensburg–Prescott International Bridge, 5 kilometres (3.1 mi) east of Prescott at Johnstown, crosses the Canada–United States border and connects the town with the city of Ogdensburg, New York.