| Postal Code Place Name | Osny |
| Region | Île-de-France |
| Department | Val-d'Oise |
| Arrondissement | Pontoise |
| Canton | Cergy-1 |
| Current Time: | CEST |
| Time Zone: | Central European Summer Time |
| IANA Time Zone: | Europe/Paris |
| Dialing Code: | 01 |
| 95000 Cergy |
| 95300 Pontoise |
| 95650 Boissy-l'Aillerie |
| 95800 Cergy |