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List of Ontario counties

Below is a list of counties in the Canadian province of Ontario. The term "county" is only used for the geographical units in the populous southern part of the province. The sub-divisions in the thinly populated northern part of the province are called districts, and do not have the same political responsibilities as a county -- in a district, county-level services are provided directly by the provincial government.

This list has not taken into account some recent reorganization of county boundaries.