In the 2021 Census of Population conducted by Statistics Canada, Saint-Joseph-de-Kamouraska had a population of 398 living in 165 of its 176 total private dwellings, a change of 1.8% from its 2016 population of 391. With a land area of 84.96 km2 (32.80 sq mi), it had a population density of 4.7/km2 (12.1/sq mi) in 2021.[4]