| Harsova to Octeville | 1,421.81 mi (2,288.18 km) |
| Harsova to Oignies | 1,223.18 mi (1,968.51 km) |
| Harsova to Oissel | 1,298.14 mi (2,089.15 km) |
| Harsova to Olivet | 1,257.19 mi (2,023.26 km) |
| Harsova to Ollioules | 1,102.04 mi (1,773.56 km) |
| Harsova to Olonne-sur-Mer | 1,433.85 mi (2,307.56 km) |
| Harsova to Oloron-Sainte-Marie | 1,417.30 mi (2,280.92 km) |
| Harsova to Onet Village | 1,244.28 mi (2,002.48 km) |
| Harsova to Onnaing | 1,196.00 mi (1,924.78 km) |
| Harsova to Orange | 1,138.99 mi (1,833.02 km) |
| Harsova to Orchies | 1,212.37 mi (1,951.12 km) |
| Harsova to Orleans | 1,256.82 mi (2,022.66 km) |
| Harsova to Orly | 1,236.60 mi (1,990.11 km) |
| Harsova to Ormesson-sur-Marne | 1,230.16 mi (1,979.76 km) |
| Harsova to Orsay | 1,245.76 mi (2,004.85 km) |
