1912  Twin Cities, when spoken of in Canada, usually refer to Port Arthur and Fort William, neighboring cities and ports in Ontario, situated on Thunder Bay, Lake Superior.
1952  Two-thirds of this population is urban however, and concentrated in the twin cities of the "Lakehead," Fort William and Port Arthur/
2 Kitchener and Waterloo in western Ontario.
1952  The "Twin Cities" constitute an exceedingly well built and prosperous appearing urban area.