L'Islet-sur-Mer, QuebecL'Islet-sur-Mer is an unincorporated community in L'Islet, Quebec, Canada. It is recognized as a designated place by Statistics Canada.DemographicsIn the 2021 Census of Population conducted by Statistics Canada, L'Islet-sur-Mer had a population of 652 living in 294 of its 315 total private dwellings, a change of from its 2016 population of 639. With a land area of, it had a population density of in 2021.