| Gex to Oignies | 318.39 mi (512.40 km) |
| Gex to Oissel | 310.14 mi (499.13 km) |
| Gex to Olivet | 222.26 mi (357.69 km) |
| Gex to Ollioules | 220.92 mi (355.54 km) |
| Gex to Olonne-sur-Mer | 372.99 mi (600.26 km) |
| Gex to Oloron-Sainte-Marie | 392.13 mi (631.08 km) |
| Gex to Onet Village | 216.25 mi (348.02 km) |
| Gex to Onnaing | 302.00 mi (486.02 km) |
| Gex to Orange | 163.36 mi (262.90 km) |
| Gex to Orchies | 313.84 mi (505.08 km) |
| Gex to Orleans | 223.13 mi (359.09 km) |
| Gex to Orly | 238.62 mi (384.02 km) |
| Gex to Ormesson-sur-Marne | 235.84 mi (379.54 km) |
| Gex to Orsay | 243.49 mi (391.86 km) |
| Gex to Orthez | 387.48 mi (623.58 km) |
