| 1972-07-01 | Deletion | 80443 | Hornoy |
| 1972-07-01 | Association merger | 80111 → 80443 | Boisrault → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80382 → 80443 | Gouy-l'Hôpital → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80443 | Hornoy → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80483 → 80443 | Lincheux-Hallivillers → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80612 → 80443 | Orival → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80731 → 80443 | Selincourt → Hornoy-le-Bourg |
| 1972-07-01 | Association merger | 80768 → 80443 | Tronchoy → Hornoy-le-Bourg |
| 1943-01-01 | Creation | 80443 | Hornoy |