As a designated place in the 2016 Census of Population conducted by Statistics Canada, Duhamel recorded a population of 47 living in 18 of its 18 total private dwellings, a change of from its 2011 population of 30.
As a designated place in the 2011 Census, Duhamel had a population of 30 living in 12 of its 15 total dwellings, a -14.3% change from its 2006 population of 35.