As a designated place in the 2016 Census of Population conducted by Statistics Canada, Tompkins recorded a population of 114 living in 48 of its 66 total private dwellings, a change of  from its 2011 population of 135.
In the 2016 Census of Population conducted by Statistics Canada, Tompkins was recognized as a residential community with a population of 114 inhabitants residing in 48 out of its 66 total dwellings, indicating a decline from 135 residents in 2011.