| Grottammare to Octeville | 868.24 mi (1,397.29 km) |
| Grottammare to Oignies | 728.09 mi (1,171.75 km) |
| Grottammare to Oissel | 750.91 mi (1,208.47 km) |
| Grottammare to Olivet | 669.78 mi (1,077.90 km) |
| Grottammare to Ollioules | 404.76 mi (651.40 km) |
| Grottammare to Olonne-sur-Mer | 803.79 mi (1,293.57 km) |
| Grottammare to Oloron-Sainte-Marie | 729.45 mi (1,173.94 km) |
| Grottammare to Onet Village | 570.77 mi (918.56 km) |
| Grottammare to Onnaing | 704.50 mi (1,133.79 km) |
| Grottammare to Orange | 460.04 mi (740.36 km) |
| Grottammare to Orchies | 720.08 mi (1,158.85 km) |
| Grottammare to Orleans | 670.59 mi (1,079.21 km) |
| Grottammare to Orly | 679.09 mi (1,092.88 km) |
| Grottammare to Ormesson-sur-Marne | 674.98 mi (1,086.28 km) |
| Grottammare to Orsay | 685.46 mi (1,103.14 km) |
