St. Lawrence County is a county in the U.S. state of New York. As of the 2020 census, the population was 108,505. The county seat is Canton. The county is named for the Saint Lawrence River. This was as named by early French explorer Jacques Cartier for the Christian saint Lawrence of Rome, as he visited the river on the saint's feast day. The county is part of the North Country region of the state.

Canton is a village and county seat of St. Lawrence County, New York, United States. The village is centrally located in both the town of Canton and the county of St. Lawrence. The population was 7,155 at the 2020 census. The name comes from Canton in Cardiff, Wales.