A few more from Newfoundland. We don't have many at all because municipalities did not exist here until 1888. Until that point, our only level of government was the national one. And even when municipalities were allowed, they were mainly advisory councils to Parliament. They didn't even have Mayors.
Consequently, we have no purpose-built city halls that pre-date 1888.
Most across the province are some version of this (all photos from FB/town websites):
Channel-Port-aux-Basques
Paradise
The nice ones are in buildings erected for another purpose (we have gorgeous halls for just about every imaginable religious brotherhood in every other town).
Bay Roberts
And some are unique for our province. This one, for example, was built by the Anglo-Newfoundland Development Company in 1929. The company basically owned the town.
Grand Falls-Windsor