Johnstown, Leeds and Grenville United Counties, Ontario

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Johnstown is a community in eastern Ontario, Canada. It was established in 1798 from part of Eastern District, and is located in of the United Counties of Leeds and Grenville.

Early settlers were mostly from Scotland and Ireland.

Located in the township of Edwardsburgh/Cardinal, the community is the Canadian terminus of the Ogdensburg-Prescott International Bridge and the southern terminus of provincial Highway 416.