Southwestern Ontario

"Western Ontario" redirects here. For the far western part of Ontario, see Northwestern Ontario. For the university in London, Ontario, see University of Western Ontario.
Southwestern Ontario
Secondary region
Coordinates: 43°30′N 81°00′W / 43.500°N 81.000°W / 43.500; -81.000
Country Canada
Province Ontario
Area
 • Total
36,797.54 km2 (14,207.61 sq mi)
Population
 (2021)
 • Total
2,796,367
 • Density75.99331/km2 (196.8218/sq mi)
Time zoneUTC−5 (EST)
 • Summer (DST)UTC−4 (EDT)
Postal code prefixes
N
Area codes519, 226, 548, 905, 289, 365

Southwestern Ontario (census population 2,796,367 in 2021) is a secondary region of Southern Ontario in the Canadian province of Ontario. It occupies most of the Ontario Peninsula, bounded by Lake Huron (including Georgian Bay) to the north and northwest, the St. Clair River, Lake St. Clair, and Detroit River to the west, and Lake Erie to the south. To the east, on land, Southwestern Ontario is bounded by Central Ontario and the Golden Horseshoe. It borders the United States via Michigan.

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