| Grezzana to Octeville | 653.80 mi (1,052.18 km) |
| Grezzana to Oignies | 504.17 mi (811.38 km) |
| Grezzana to Oissel | 533.31 mi (858.28 km) |
| Grezzana to Olivet | 461.13 mi (742.12 km) |
| Grezzana to Ollioules | 303.67 mi (488.70 km) |
| Grezzana to Olonne-sur-Mer | 616.89 mi (992.79 km) |
| Grezzana to Oloron-Sainte-Marie | 595.62 mi (958.56 km) |
| Grezzana to Onet Village | 419.34 mi (674.87 km) |
| Grezzana to Onnaing | 480.31 mi (772.99 km) |
| Grezzana to Orange | 318.63 mi (512.78 km) |
| Grezzana to Orchies | 495.99 mi (798.23 km) |
| Grezzana to Orleans | 461.56 mi (742.81 km) |
| Grezzana to Orly | 462.27 mi (743.95 km) |
| Grezzana to Ormesson-sur-Marne | 457.58 mi (736.40 km) |
| Grezzana to Orsay | 469.40 mi (755.42 km) |
