Looking at a map of your state...

[Hatman 🍁]

Easily, all of them... probably. Definitely with a blank map.

[Hatman 🍁]

Around 10 on 80-something.

Quebec has silly counties, whose borders are often changing and often have silly names or long names with hyphen.

I could probably get more than 10 in Quebec. They're not all silly

[Hatman 🍁]

I can easily get all French departments and I think all Spanish provinces, but I get only 30-35ish out of 50 in Ontario. I get all 17 Quebec regions but I obviously barely know the MRCs of which there are way too many.

Sometimes I get Oxford and Brant confused, but that's only if I'm not thinking well. That and Perth and Wellington. Otherwise, Ontario's counties are pretty easy. The historical counties are a bit more tricky however.

[Hatman 🍁]

Ontario has 50 census divisions, Teddy. And I don't know where you got that map, as Russell County was never shaped like that. When it was a county, it included Cumberland which is now in Ottawa. Its merger with Prescott County came long before it lost Cumberland.

Also, your map oddly does not separate Haldimand and Norfolk, does not contain Ontario County or Lincoln County.

[Hatman 🍁]

Lincoln is part of the Niagara region.

And I counted Haldimand-Norfolk as one, but I can easily split it in two

As for the north, they are not counties, or equiv. so I don't care about them

They are county equivalents... they even have district seats. (no real government though, but there is some organization with them)

And, Lincoln is a former county, which your map doesn't show. It amalgamated with Welland County (which I forgot about) in 1970.