Map of St. Thomas, Canada

St. Thomas is a city in Ontario, Canada, with a population of about 38,909. It lies at 42.7736°N, 81.1804°W. St. Thomas is about 527 km (327 mi) southwest of Ottawa, the capital. The nearest city on our map is London, 24 km to the north.

St. Thomas at a glance

Where is St. Thomas?

• Located in the Northern and Western hemispheres.
• Daylight ranges from about 9 h 02 min on the shortest day to 15 h 20 min on the longest day (around 21 December and 21 June).

Cities near St. Thomas

• London — 24 km north
• Woodstock — 53 km northeast
• Norfolk County — 65 km east
• Brant — 79 km northeast
• Brantford — 84 km northeast
• Kitchener — 91 km northeast
• Chatham — 92 km southwest
• Waterloo — 94 km northeast
• Cambridge — 96 km northeast
• Sarnia — 102 km west

Largest cities in Ontario

• Toronto — 2,794,356
• Ottawa — 1,017,449
• Mississauga — 717,961
• Brampton — 656,480
• Hamilton — 569,353
• London — 422,324
• Etobicoke — 365,000
• Markham — 338,503
• Vaughan — 323,103
• Kitchener — 256,885

Largest cities in Canada

• Toronto — 2,794,356
• Montréal — 1,762,949
• Calgary — 1,306,784
• Ottawa — 1,017,449
• Edmonton — 1,010,899
• Winnipeg — 749,607
• Mississauga — 717,961
• Vancouver — 662,248
• Brampton — 656,480
• Hamilton — 569,353

Map of Canada and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.