| Postal Code | Place Name | Region | Department | Arrondissement | Canton |
|---|---|---|---|---|---|
| 01100 | Oyonnax | Auvergne-Rhône-Alpes | Ain | Nantua | Oyonnax |
| 01130 | Nantua | Auvergne-Rhône-Alpes | Ain | Nantua | Bellegarde-sur-Valserine |
| 01200 | Bellegarde-sur-Valserine | Auvergne-Rhône-Alpes | Ain | Nantua | Bellegarde-sur-Valserine |
| 01430 | Saint-Martin-du-Frêne | Auvergne-Rhône-Alpes | Ain | Nantua | Hauteville-Lompnes |
| 01450 | Poncin | Auvergne-Rhône-Alpes | Ain | Nantua | Pont-d'Ain |
| 01460 | Montréal-la-Cluse | Auvergne-Rhône-Alpes | Ain | Nantua | Nantua |
| 01580 | Izernore | Auvergne-Rhône-Alpes | Ain | Nantua | Pont-d'Ain |
| 01590 | Dortan | Auvergne-Rhône-Alpes | Ain | Nantua | Pont-d'Ain |
| 01640 | Saint-Jean-le-Vieux | Auvergne-Rhône-Alpes | Ain | Nantua | Pont-d'Ain |