Saint-Louis-de-l'Isle-aux-Coudres is an unincorporated community in Quebec, Canada. It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Saint-Louis-de-l'Isle-aux-Coudres had a population of 342 living in 183 of its 236 total private dwellings, a change of from its 2016 population of 335. With a land area of , it had a population density of in 2021.