The population of the City of Chestermere according to its 2017 municipal census is 20,331, a change of 3.1% from its 2016 municipal census population of 19,715.

In the 2016 Census of Population conducted by Statistics Canada, the City of Chestermere recorded a population of 19,887 living in 6,112 of its 6,250 total private dwellings, a change of 34.2% from its 2011 population of 14,824. With a land area of 32.94 km2 (12.72 sq mi), it had a population density of 603.7/km2 (1,563.7/sq mi) in 2016.