| 2007-07-01 | Association merger converted to a simple merger | 44131 | Pornic |
| 2007-07-01 | Association merger converted to a simple merger | 44177 → 44131 | Sainte-Marie → Pornic |
| 1987-09-08 | Association merger converted to a simple merger | 44042 → 44131 | Le Clion-sur-Mer → Pornic |
| 1987-09-08 | Association merger converted to a simple merger | 44131 | Pornic |
| 1973-06-01 | Association merger | 44042 → 44131 | Le Clion-sur-Mer → Pornic |
| 1973-06-01 | Association merger | 44131 | Pornic |
| 1973-06-01 | Association merger | 44177 → 44131 | Sainte-Marie → Pornic |
| 1943-01-01 | Creation | 44131 | Pornic |