| Postal Code | Place Name | Region | Department | Arrondissement | Canton |
|---|---|---|---|---|---|
| 01170 | Gex | Auvergne-Rhône-Alpes | Ain | Gex | Thoiry |
| 01210 | Ferney-Voltaire | Auvergne-Rhône-Alpes | Ain | Gex | Saint-Genis-Pouilly |
| 01220 | Divonne-les-Bains | Auvergne-Rhône-Alpes | Ain | Gex | Gex |
| 01280 | Prévessin-Moëns | Auvergne-Rhône-Alpes | Ain | Gex | Saint-Genis-Pouilly |
| 01410 | Champfromier | Auvergne-Rhône-Alpes | Ain | Gex | Thoiry |
| 01550 | Pougny | Auvergne-Rhône-Alpes | Ain | Gex | Thoiry |
| 01630 | Saint-Genis-Pouilly | Auvergne-Rhône-Alpes | Ain | Gex | Thoiry |
| 01710 | Thoiry | Auvergne-Rhône-Alpes | Ain | Gex | Thoiry |