| Gagny to Oignies | 111.49 mi (179.43 km) |
| Gagny to Oissel | 72.50 mi (116.68 km) |
| Gagny to Olivet | 76.18 mi (122.61 km) |
| Gagny to Ollioules | 427.43 mi (687.87 km) |
| Gagny to Olonne-sur-Mer | 257.57 mi (414.53 km) |
| Gagny to Oloron-Sainte-Marie | 420.84 mi (677.28 km) |
| Gagny to Onet Village | 312.16 mi (502.37 km) |
| Gagny to Onnaing | 114.35 mi (184.02 km) |
| Gagny to Orange | 345.21 mi (555.57 km) |
| Gagny to Orchies | 114.45 mi (184.20 km) |
| Gagny to Orleans | 73.57 mi (118.40 km) |
| Gagny to Orly | 11.56 mi (18.60 km) |
| Gagny to Ormesson-sur-Marne | 6.74 mi (10.85 km) |
| Gagny to Orsay | 20.29 mi (32.65 km) |
| Gagny to Orthez | 404.79 mi (651.45 km) |
