[Sam Gamgee]

Actually not all that true. The Greater Toronto Area is massive with one quarter of all Canadians living there. But maybe you have something there.

https://roadsidethoughts.com/ranked-by-population-density.htm

Ontario is 22 and Quebec is 9 people per square km. New York is 400. Still to be fair any analysis needs to be more comprehensive than that, comparing metro areas to metro areas.

[Alberta's Child]

Something like 2/3rds of Canada’s population lives in its ten largest metro areas. It’s a much more urbanized population than most people outside Canada realize.

Maybe few of them are as densely populated as New York City, but they are comparable to most U.S. cities.

[Paul R.]

NYC is a lot of the drive in the US numbers. It’s population density is over twice that of Toronto, and a tremendous amount of overseas travel funnels through it.

It’d also be interesting to compare what % of the population uses mass transit daily, and for how long each day, in the two cities.