It is predominantly French speaking, is 1° further north than Dunkirk, is incorporated as Ville de Fermont, has a population of about 2400.
It also has a Wikipedia page that claims "Fermont is arguably the world's northernmost Francophone settlement of any considerable size": https://en.wikipedia.org/wiki/Fermont.
It's much cooler that Dunkirk should hold this distinction, isn't it, so can we agree please that these rather undistinguished places in Canada don't count? Anyway Dunkirk is a proper town/city (91K people, interesting history) not like this awful sounding place where everyone lives in a single building because it's like the moon there or something.