In the 2021 Census of Population conducted by Statistics Canada, Denzil had a population of 140 living in 64 of its 71 total private dwellings, a change of -2.1% from its 2016 population of 143. With a land area of 0.61 km2 (0.24 sq mi), it had a population density of 229.5/km2 (594.4/sq mi) in 2021.[8]
In the 2016 Census of Population, the Village of Denzil recorded a population of 143 living in 61 of its 73 total private dwellings, a 5.6% change from its 2011 population of 135. With a land area of 0.55 km2 (0.21 sq mi), it had a population density of 260.0/km2 (673.4/sq mi) in 2016.[9]