In the 2021 Census of Population conducted by Statistics Canada, Warren had a population of 1,015 living in 329 of its 341 total private dwellings, a change of  from its 2016 population of 818.
In the 2021 Census of Population conducted by Statistics Canada, Warren had a population of 1,015 living in 329 of its 341 total private dwellings, a change from its 2016 population of 818.