It’s relatively rare, but in some countries — France and Ecuador are two that I know of — citizens living abroad have their own representation in the national legislature (so they vote as overseas citizens, rather than as former residents of a particular department or province).

Indeed, and one of the limitations on the weight of overseas voters in US elections is the fact that they will be registered (if they are) across lots of states-of-last-residence. In a “border town” like Windsor, a disproportionate # may have connections to/last resided in MI, but I don’t know!

(And more Indian, Chinese, Pakistani, and Philippine citizens in Toronto than Brits or Yanks … but the point remains — plenty of potential US voters to reach!)

Correction: It’s ~90k Americans of all ages (including kids) in Toronto. A mere 68k+ aged 15 and up in 2021. Interesting: Marginally more Brits than Yanks in Toronto. The Commonwealth lives!

From the same data, it’s something like 90k in Toronto and 50k in Vancouver, to take just a couple of major Canadian metro areas …

The stats are here:

I also enjoy “more trains than usual needing repairs at the same time.”

Here you go: 10,325 US citizens aged 15 and up in the Windsor metropolitan area, according to the 2021 Canadian census.

Mistyped: 6,730 (see under, “Selected places of birth for the immigrant population”)

6,790 residents born in the USA (and therefore citizens), per the 2021 Canadian census. (Unclear how many naturalized US citizens might live there, nor how many Canadian-born residents might be Americans by virtue of birth to an eligible US citizen parent.)