Toronto is about 6 times smaller than Melbourne.

Melbourne (the 27 councils of metropolitan Melbourne, without the Yarra Ranges, Cardinia, Mornington Peninsula and Nillumbik) is approximately 3,915 sq km, while Toronto is approximately 630 sq km, making Toronto 16.1% the size of Melbourne.
Tip: This to-scale comparison of Melbourne vs. Toronto uses the Mercator projection, which distorts the size of regions near the poles.
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