| 2016-01-01 | Creation of a new commune | 27049 | Beaumesnil |
| 2016-01-01 | Creation of a new commune | 27049 | Beaumesnil → Mesnil-en-Ouche |
| 2016-01-01 | Deletion | 27049 | Beaumesnil |
| 2016-01-01 | Creation of a new commune | 27007 → 27049 | Ajou → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27041 → 27049 | La Barre-en-Ouche → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27088 → 27049 | Bosc-Renoult-en-Ouche → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27221 → 27049 | Épinay → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27283 → 27049 | Gisay-la-Coudre → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27292 → 27049 | Gouttières → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27296 → 27049 | Granchain → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27356 → 27049 | Jonquerets-de-Livet → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27362 → 27049 | Landepéreuse → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27499 → 27049 | La Roussière → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27513 → 27049 | Saint-Aubin-des-Hayes → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27515 → 27049 | Saint-Aubin-le-Guichard → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27566 → 27049 | Sainte-Marguerite-en-Ouche → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27596 → 27049 | Saint-Pierre-du-Mesnil → Mesnil-en-Ouche |
| 2016-01-01 | Creation of a new commune | 27628 → 27049 | Thevray → Mesnil-en-Ouche |
| 1943-01-01 | Creation | 27049 | Beaumesnil |