^Yeah, I've got to get up to Carleton Place. I only know it as a godawful strip of Tim Hortons and Rona Home Improvement stores along Highway 7, which looks like something straight out of suburban Michigan.
An underrated modern one is Vaughan's:
Source
I might be in the minority, but I like Mississauga's po-mo city hall. If they don't cut corners, po-mo architecture can be quite a treat.
I really like Douglas Cardinal's St. Albert city hall too.