Mesnil-Roc’h (Breton: Sant-Pêr-Plewenn) is a commune in the Ille-et-Vilaine department in Brittany in northwestern France. It was established on 1 January 2019 by merger of the former communes of Saint-Pierre-de-Plesguen (the seat), Lanhélin and Tressé.[2]
Population
Population data refer to the commune in its geography as of January 2025.
| Year | Pop. | ±% p.a. |
|---|---|---|
| 1968 | 3,009 | — |
| 1975 | 2,903 | −0.51% |
| 1982 | 2,960 | +0.28% |
| 1990 | 2,960 | +0.00% |
| 1999 | 2,848 | −0.43% |
| 2007 | 3,630 | +3.08% |
| 2012 | 4,047 | +2.20% |
| 2017 | 4,301 | +1.22% |
| 2023 | 4,492 | +0.73% |
| Source: INSEE[3] | ||
See also
References
- ^ “Populations de référence 2023” (in French). National Institute of Statistics and Economic Studies. 18 December 2025.
- ^ Arrêté préfectoral 11 December 2018 (in French)
- ^ Population municipale entre 1968 et 2023, INSEE
