I'm glad you saw this 4.27 million number for Toronto, too, because it looks like it's been revised down to 3.73 million. I was starting to think I'd imagined the higher number. Nevertheless, with regards to earlier comparisons with Greater London, at 3.73 million people in Toronto with an area of 630.2 km2, we'll have a population density of 5,925 people /km2. By comparison, in 2019, Greater London had a population of 8,899,375 and an area of 1,572 km2 for a population density of 5,671/km2. This comparison may not be entirely apples-to-apples as Greater London is significantly larger geographically and has considerable amount of unurbanised land around its edges (probably protected). Still, Toronto is moving into a different echelon of cities, which I find fascinating.New projections out via the Ontario Population Projection to 2046.
Learn about the 2020-2046 population projections for Ontario and its 49 census divisions.www.fin.gov.on.ca
They have a number for the GTA, excluding Hamilton, of 10.2M in 2046
If you assumed that the rest of the numbers in the chart above flatlined from 2041 (there is no GGH number in today's link)
You get 11,000,000 for the GTAH, 15.1M for the GGH
The 2046 number for the City of Toronto is now 4.27M