Based on Grenville County, it was located on the north shore of the Saint Lawrence River, east of Lake Ontario.

Grenville electoral district was located on the north shore of the Saint Lawrence River in the eastern area of Canada West, east of Kingston.

[2] Grenville County had been an electoral district in the Legislative Assembly of Upper Canada,[3] and its boundaries were not altered by the Union Act.

Those boundaries had originally been set by a proclamation of the first Lieutenant Governor of Upper Canada, John Graves Simcoe, in 1792: The boundaries had been further defined by a statute of Upper Canada in 1798: Since Grenville electoral district was not changed by the Union Act, those boundaries continued to be used for the new electoral district.

This article incorporates text from this source, which is in the public domain: Proclamation, Lieutenant Governor John Graves Simcoe, July 16, 1792 This article incorporates text from this source, which is in the public domain: An act for the better division of this province, SUC 1798, c. 5.