Back Southwestern ontario CEB Edela-Ontario Estonian انتاریو جنوب باختری Persian Sud-Ouest de l'Ontario French Sudoeste de Ontário Portuguese Юго-Западное Онтарио Russian Southwestern Ontario SIMPLE Југозападни Онтарио Serbian Southwestern Ontario Swedish Південно-Західне Онтаріо Ukrainian
Southwestern Ontario | |
|---|---|
Secondary region | |
 | |
| Coordinates: 43°30′N 81°00′W / 43.500°N 81.000°W | |
| Country |  Canada |
| Province |  Ontario |
| Area | |
• Total | 36,797.54 km2 (14,207.61 sq mi) |
| Population (2021) | |
• Total | 2,796,367 |
| • Density | 76/km2 (200/sq mi) |
| Time zone | UTC−5 (EST) |
| • Summer (DST) | UTC−4 (EDT) |
| Postal code prefixes | |
| Area code(s) | 519, 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.