wikipedia only lists 4 for Canada:
Halifax and Dartmouth, Nova Scotia[n 1]
Kitchener and Waterloo, Ontario
Ottawa, Ontario and Gatineau, Quebec[n 2]
Battleford and North Battleford, Saskatchewan[n 3]
https://en.wikipedia.org/wiki/Twin_cities
and three that involce international boundaries
Niagara Falls, Ontario, Canada; Niagara Falls, New York, United States
North Portal, Saskatchewan, Canada; Portal, North Dakota, United States
Sault Ste. Marie, Ontario, Canada; Sault Ste. Marie, Michigan, United States