| Grottaferrata to Octeville | 875.21 mi (1,408.52 km) |
| Grottaferrata to Oignies | 756.64 mi (1,217.70 km) |
| Grottaferrata to Oissel | 764.03 mi (1,229.59 km) |
| Grottaferrata to Olivet | 673.34 mi (1,083.63 km) |
| Grottaferrata to Ollioules | 360.05 mi (579.45 km) |
| Grottaferrata to Olonne-sur-Mer | 785.97 mi (1,264.90 km) |
| Grottaferrata to Oloron-Sainte-Marie | 682.70 mi (1,098.70 km) |
| Grottaferrata to Onet Village | 538.46 mi (866.57 km) |
| Grottaferrata to Onnaing | 735.11 mi (1,183.04 km) |
| Grottaferrata to Orange | 429.17 mi (690.69 km) |
| Grottaferrata to Orchies | 749.72 mi (1,206.55 km) |
| Grottaferrata to Orleans | 674.53 mi (1,085.56 km) |
| Grottaferrata to Orly | 692.26 mi (1,114.09 km) |
| Grottaferrata to Ormesson-sur-Marne | 689.10 mi (1,109.00 km) |
| Grottaferrata to Orsay | 697.44 mi (1,122.43 km) |
