London is a city in southwestern Ontario, Canada, along the Quebec City–Windsor Corridor. The city had a population of 422,324 according to the 2021 Canadian census. London is at the confluence of the Thames River and North Thames River, approximately 200 km from both Toronto and Detroit; and about 230 km from Buffalo, New York. The city of London is politically separate from Middlesex County, though it remains the county seat.
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