However, the next challenge is to find out what were the instructions given to the enumerators. For those censuses taking place after the 1867 Confederation you can find PDF copies of the proclamations and/or manuals on several web sites such as the Internet Archive, Library and Archives Canada, or even the University of Ottawa.
- 1871 Census of Canada Enumerator Manual
- 1881 Census of Canada Enumerator Manual
- 1891 Census of Canada Enumerator Manual
- 1901 Census of Canada Enumerator Manual
- 1906 Proclamation and Enumerator Instructions for the Census of the Northwest Provinces
- 1911 Census of Canada Enumerator Instructions
- 1916 Proclamation and Enumerator Instructions for the Census of the Prairie Provinces
- 1921 Census of Canada Enumerator Instructions
- 1851/52 Census for the Province of Canada including New Brunswick and Nova Scotia
- 1861 Census for the Province of Canada including New Brunswick, Nova Scotia, and Prince Edward Island
Those excerpts may be found in David P. Gagan's article "Enumerator's Instructions for the Census of Canada 1852 and 1861" in the "Histoire Sociale/Social History", Vol. VII, No. 14 (November 1974). Use WorldCat to see if you can find a copy close to you to peruse.
For those more recent census enumerations of Canada such as those taken in 1926, 1931, 1936, 1941, and 1946 a search of the Internet Archive can locate the enumerator manuals.
Tip: Save those PDF files to your computer just in case they disappear from the various web sites.