| Formia to Octeville | 935.52 mi (1,505.57 km) |
| Formia to Oignies | 814.09 mi (1,310.16 km) |
| Formia to Oissel | 823.74 mi (1,325.69 km) |
| Formia to Olivet | 733.75 mi (1,180.85 km) |
| Formia to Ollioules | 418.01 mi (672.72 km) |
| Formia to Olonne-sur-Mer | 846.33 mi (1,362.04 km) |
| Formia to Oloron-Sainte-Marie | 738.81 mi (1,188.99 km) |
| Formia to Onet Village | 597.70 mi (961.91 km) |
| Formia to Onnaing | 792.13 mi (1,274.81 km) |
| Formia to Orange | 488.88 mi (786.78 km) |
| Formia to Orchies | 806.95 mi (1,298.66 km) |
| Formia to Orleans | 734.92 mi (1,182.74 km) |
| Formia to Orly | 751.90 mi (1,210.06 km) |
| Formia to Ormesson-sur-Marne | 748.63 mi (1,204.80 km) |
| Formia to Orsay | 757.21 mi (1,218.61 km) |
