The information about the 1666 census came from a number of places. One was the Statistics Canada site which included the names of the various districts, the number of people in each of those, and the number of people in each age group. The second source was from an archived website found in the WayBack Machine that Google maintains. The site had been archived between 2002-2004. The author of that transcript was Hugh L. Armstrong. on his website he stated the following:

"Statistics for the 1666 census from 'Censuses of Canada, 1665 to 1871, vol. IV; published in Ottawa, 1876 by I.B. Taylor. Glossary of some of the French words and phrases used in the census."

This link goes to a partial duplicate of the site hosted at RootsWeb; it confirms the source of the data used here for the digital transcriptions.

Note: There exists a discrepancy in the number of people listed in some regions. The number is indicated beside each name of the region with the Statistics Canada numbers followed by "sc". The other number is what represents the names shown in each district on each page above. Two discrepancies appear to be due to twins. The I'le d'Orleans has a discrepancy of 19 less in the census which at this time (2020-02-23) can not be easily accounted for.

However, this webpage tries to explains the discrepancy thanks to Hugh L. Armstrong:

This census was taken during the months of February and March, 1666, as ascertained by the examination of Parochial Registers. This nominal Census is in 154 pages of manuscript is deposited in the Archives of Paris, and there is a copy in the Parliamentary Library in Ottawa.

The repetition of 21 names, forming five families, has been corrected in the present tables, reducing the number of the population from 3236 to 3215.

The Royal troops, consisting of from 1000 to 1200 men, in 24 companies, are not included in the Census. It has been ascertained that the names of thirty ecclesiastics and nuns are wanting, namely four secular ecclesiastics at Quebec; five at Montreal; ten nuns at Montreal and eleven Jesuits employed in the Indian missions.

The whole of the clergy comprised one Bishop, eighteen Priests and ecclesiastics, thirty-one Jesuit priests and brethren.

There were eighteen Ursuline nuns, twenty-three nuns of the Hospitaller order and four Filles Pieuses of the clergy.

The clergy, nobility, public fumctionaries and farmers are not indicated in the Census of Professions and Trades.

There had been a somewhat considerable immigration, composed of nobility, farmers and artisans. It also comprised fifty young women, well trained and educated, from an orphanage in Paris.
Hugh L. Armstrong

The Canadiana Heritage website provides one of the copies created by hand of the original census presumably. In reviewing the original pages from the 1666 census, errors become obvious in Hugh L. Armstrongs web file as well as the transcription from the original census. It is not clear if in fact the one shown here is the original which is held in France. Based on a notation above, one of the copies of the 1666 census is in France, most likely the original, and the other at the Canadian Archives.

Given the screen shots below of the entries that have been documented as our Jean Baril over the years, it becomes quite obvious that it is NOT clear that Jean Barillet shown as an 18 year old Domestique at Trois Rivières, working for the Jesuit Order is our Jean. Nor is it clear that the Jean Barreau dit xaintonge is our Jean.

Below are 4 entries in the Trois Rivières census that have been claimed by various individuals to be our Jean Baril.

(France) 1666 Census, Page 147

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