Potsdam is a town in St. Lawrence County, New York, United States. The town population was 17,029 at the 2010 census. The ZIP Code is 13676. Potsdam is a cultural and educational hub of Northern New York. When SUNY Potsdam and Clarkson University are in session, the population increases by approximately 8,000 students. The town is named after the city of Potsdam in Germany. The Town of Potsdam also contains a village named Potsdam. Potsdam is centrally located within the county and northeast of Canton, the county seat.