The county was founded in 1802 and named for the Saint Lawrence River, which in turn was named for the Catholic saint on whose Feast day the river was discovered by French explorers. Canton is the county seat.

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Main Industries: Acco Corp. located its eastern North America distribution center in Ogdensburg, and the Cives Corp. distributes structural steel throughout the Northeastern US from its facility in the Village of Gouverneur. The county is close to Ottawa, Ontario, which is Canada's capital city, and to Montreal, Quebec, North America's French-speaking metropolis.

Land: The southeastern third of the county, 953 square miles, is within the Adirondack region, one of America's most unique wild areas - unique in being a patchwork of private and public lands, with several hamlets, paper and wood products industries, and a vacation destination.

Education: St. Lawrence County is home to SUNY Potsdam and its Crane School of Music, Clarkson University, St. Lawrence University, SUNY Canton Technical College, SUNY College of Environmental Science and Forestry's Ranger School, and Wadhams Hall and Seminary.

County Administrator - Ruth A. Doyle

Chair, Board of Legislators - William J. Sheridan

• Ogdensburg, City of
• Brasher, Town of
• Canton, Town of
  • Canton, Village of
  • Rensselaer Falls, Village of
• Clare, Town of
• Clifton, Town of
• Colton, Town of
• De Kalb, Town of
  • Richville, Village of
• De Peyster, Town of
• Edwards, Town of
• Fine, Town of
• Fowler, Town of
• Gouverneur, Town of
  • Gouverneur, Village of
• Hammond, Town of
  • Hammond, Village of
• Hermon, Town of
• Hopkinton, Town of
• Lawrence, Town of
• Lisbon, Town of
• Louisville, Town of
• Macomb, Town of
• Madrid, Town of
• Massena, Town of
  • Massena, Village of (shared with Louisville)
• Morristown, Town of
• Norfolk, Town of
  • Norwood, Village of (shared with Potsdam)
• Oswegatchie, Town of
  • Heuvelton, Village of
• Parishville, Town of
• Piercefield, Town of
• Pierrepont, Town of
• Pitcairn, Town of
• Potsdam, Town of
  • Potsdam, Village of
• Rossie, Town of
• Russell, Town of
• Stockholm, Town of
• Waddington, Town of
  • Waddington, Village of