This commune has 3 delegated communes.
| Code | Name |
|---|---|
| 22192 | Plessix-Balisson |
| 22209 | Ploubalay |
| 22357 | Trégon |
| Date | Type | Code | Name |
|---|---|---|---|
| 2017-01-01 | Deletion | 22209 | Ploubalay |
| 2017-01-01 | Creation of a new commune | 22192 → 22209 | Plessix-Balisson → Beaussais-sur-Mer |
| 2017-01-01 | Creation of a new commune | 22209 | Ploubalay → Beaussais-sur-Mer |
| 2017-01-01 | Creation of a new commune | 22209 | Ploubalay |
| 2017-01-01 | Creation of a new commune | 22357 → 22209 | Trégon → Beaussais-sur-Mer |
| 1943-01-01 | Creation | 22209 | Ploubalay |