| Date | Type | Code | Name |
|---|---|---|---|
| 1964-07-01 | Simple merger | 85085 → 85151 | Evrunes → Mortagne-sur-Sèvre |
| 1964-07-01 | Simple merger | 85151 | Mortagne-sur-Sèvre |
| 1964-07-01 | Simple merger | 85225 → 85151 | Saint-Hilaire-de-Mortagne → Mortagne-sur-Sèvre |
| 1956-12-27 | Creation | 85151 | Mortagne-sur-Sèvre |
| 1956-12-27 | Name change | 85151 | Mortagne → Mortagne-sur-Sèvre |
| 1943-01-01 | Creation | 85151 | Mortagne |