Leeds and Grenville, Ontario
Located in Ontario, part of Eastern Canada
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The United Counties of Leeds and Grenville were formed in 1850 by unifying Leeds County and Grenville County.
| 1792 | Leeds County, Upper Canada and Grenville County, Upper Canada formed |
| 1841 | Acts of Union 1840 created a single Province of Canada (Leeds County, Province of Canada and Grenville County, Province of Canada) |
| 1850 | Counties are merged to produce Leeds and Grenville, Province of Canada |
| 1867 | Canadian Confederation established the modern province of Ontario (Leeds and Grenville, Ontario) |
