The estimated 2024 population of Sainte-Agathe-des-Monts is 11,849. The population of Sainte-Agathe-des-Monts was recorded at 11,211 in the 2021 Canadian Census, and was recorded at 10,223 in the 2016 census. This is a change in population of 988, which is an annual growth rate of 1.86%.