Petit-Rocher-Sud is an unincorporated place in New Brunswick, Canada, located south of Petit-Rocher. It is recognized as a designated place by Statistics Canada.
In the 2021 Census of Population conducted by Statistics Canada, Petit-Rocher-Sud had a population of 393 living in 186 of its 208 total private dwellings, a change of -4.4% from its 2016 population of 411. With a land area of 2.2 km2 (0.85 sq mi), it had a population density of 178.6/km2 (462.7/sq mi) in 2021. [1]