It has been transcribed and you can access it in Ancestry and also for free at Library and Archives Canada.
This census of Canada covered the nine provinces and two territories of Canada as of 1921: Alberta, British Columbia, Manitoba, New Brunswick, Nova Scotia, Ontario, Prince Edward Island, Quebec, Saskatchewan, the Yukon Territory, and the Northwest Territories.
The census provides many details about individuals and families including:
Canada's population in 1921 was tallied at 8,788,483. This represented a 21.95% increase over 1911, which was not as high as expected. Origins of the population according to the census: 55.4% British (4,868,903), 27.9% French (2,452,751); next highest was German at 3.35% (294,636). Immigrants in 1921: 148,477, of whom 75,673 were from the UK and 48,059 from the USA. Next highest nationalities were Polish and Italian.
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