In the 2021 Census of Population conducted by Statistics Canada, Denholm had a population of 75 living in 31 of its 35 total private dwellings, a change of -14.8% from its 2016 population of 88. With a land area of 0.35 km2 (0.14 sq mi), it had a population density of 214.3/km2 (555.0/sq mi) in 2021.[8]
In the 2016 Census of Population, the Village of Denholm recorded a population of 88 living in 34 of its 36 total private dwellings, a 13.6% change from its 2011 population of 76. With a land area of 0.33 km2 (0.13 sq mi), it had a population density of 266.7/km2 (690.7/sq mi) in 2016.[9]