Johnstown is a Compact rural community in the United Counties of Leeds and Grenville, in eastern Ontario, Canada, part of the township municipality of Edwardsburgh/Cardinal. It is located at the Canadian terminus of the Ogdensburg–Prescott International Bridge and at the southern termini of Highway 416 and Highway 16.
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Coordinates 44°44'40.638" N -75°27'55.057" E
