In the 2021 Census of Population conducted by Statistics Canada, Stoneham-et-Tewkesbury had a population of  living in  of its  total private dwellings, a change of  from its 2016 population of .
The 2021 Census of Population conducted by Statistics Canada showed that Stoneham-et-Tewkesbury's population was  people living in  of its total private dwellings. This figure represents a change of  from its 2016 population of .