| Grammichele to Octeville | 1,179.47 mi (1,898.17 km) |
| Grammichele to Oignies | 1,081.25 mi (1,740.10 km) |
| Grammichele to Oissel | 1,076.54 mi (1,732.53 km) |
| Grammichele to Olivet | 978.11 mi (1,574.11 km) |
| Grammichele to Ollioules | 618.14 mi (994.80 km) |
| Grammichele to Olonne-sur-Mer | 1,058.26 mi (1,703.11 km) |
| Grammichele to Oloron-Sainte-Marie | 902.37 mi (1,452.22 km) |
| Grammichele to Onet Village | 799.18 mi (1,286.15 km) |
| Grammichele to Onnaing | 1,061.10 mi (1,707.67 km) |
| Grammichele to Orange | 701.91 mi (1,129.61 km) |
| Grammichele to Orchies | 1,075.04 mi (1,730.11 km) |
| Grammichele to Orleans | 979.69 mi (1,576.65 km) |
| Grammichele to Orly | 1,006.10 mi (1,619.16 km) |
| Grammichele to Ormesson-sur-Marne | 1,003.82 mi (1,615.50 km) |
| Grammichele to Orsay | 1,010.10 mi (1,625.59 km) |
