In the 2021 Census of Population conducted by Statistics Canada, St-Pierre-Jolys had a population of 1,305 living in 508 of its 518 total private dwellings, a change of  from its 2016 population of 1,170.
According to the 2021 Census conducted by Statistics Canada, St-Pierre-Jolys had a population of 1,305 people residing in 508 out of its 518 private dwellings. This represents an increase from its 2016 population of 1,170.