In the
2021 Census of Population conducted by
Statistics Canada, Waterton Park had a population of 132 living in 54 of its 195 total private dwellings, a change of from its 2016 population of 105. With a land area of , it had a population density of in 2021. As a designated place in the
2016 Census of Population conducted by Statistics Canada, Waterton Park had a population of 105 living in 39 of its 168 total private dwellings, a change of from its 2011 population of 88. With a land area of , it had a population density of in 2016. == Climate ==