I think this is population within the 1960 city limits (Old Toronto for Toronto).
Year Montreal Ottawa Toronto Vancouver
1891 217,000 44,000 181,000 19,000
1911 471,000 87,000 377,000 100,000
1921 619,000 107,000 522,000 117,000
1931 819,000 ??????? 631,000 308,000
1941 875,000 142,000 645,000...