If you think the census is a modern invention, think again. The Nouvelle-France.org collection of archival treasures includes a number of censuses taken in New France. They can be found on the New France Archives site http://nouvelle-france.org by searching for recensements (censuses). The search brings you to this page: http://nouvelle-france.org/eng/Pages/list.aspx?k=Recensements&
This database includes 265 population census returns of New France (Nouvelle-France) and Acadia (Acadie). All are digitized versions of the original documents. Beyond 1760, the census results include pockets of former French citizens in small regions of Quebec or in the Maritime Provinces. The 1756-09-27 census (database item 12496) addresses the Acadian refugees on Ïle-St-Jean, which is present-day Prince Edward Island.
These documents have not been indexed so you will have to browse through them to find your own ancestors, but they are fun to look at. It helps if you have at least a rudimentary French vocabulary, and the beautiful old handwriting is an additional challenge, or bonus, depending on how you look at it. If you have difficulty reading it, try this website on paleography, the study of handwriting: https://paleography.library.utoronto.ca/
For example, database item number 30692, is a census of Canada, including the Quebec City area, Montreal and Trois-Rivières, taken in 1666, and stored today at the Archives nationales d’outre-mer (the Overseas National Archives) in France.
On the first page of this document, you will see an entry for a habitant family. The heading reads Quallitez et Mestiers, or quality (meaning discerning) and trade or occupation. The first family is that of Estienne Racine (Estienne or Etienne means Steven) habitant (tenant farmer), age 59, his wife (sa femme), his sons (fils) and daughters (fille.) and a hired domestic. Many of the other people counted in this census were members of religious orders.
The New France Archives project brings together digitized results from four archives in France and Canada: Library Archives Canada/Bibliothèque et Archives Canada, A.N.O.N Archives nationales d’outre-mer (France), Archives nationales (France) and BAnQ Bibliothèque et Archives nationales du Québec.