[Docere]

I just calculated the population for what called the downtown core, covering Bathurst/University to Jarvis, Davenport to the lake.*

In the 2016 census, there were 121,669 people in this area of 6.6 square km or 2.5 square miles.

I haven't bothered to do the "official" Bathurst to Don defintion, which covers 17 square km or 6.5 square miles, which is fine as a greater downtown but a little large to be the downtown core or "downtown" for comparative purposes IMO.

* Census tracts 11-15, 34-35, 62-63, 88, 89