| Gahanna to Octeville | 3,838.22 mi (6,177.02 km) |
| Gahanna to Oignies | 4,001.24 mi (6,439.38 km) |
| Gahanna to Oissel | 3,958.19 mi (6,370.10 km) |
| Gahanna to Olivet | 4,035.95 mi (6,495.24 km) |
| Gahanna to Ollioules | 4,360.27 mi (7,017.18 km) |
| Gahanna to Olonne-sur-Mer | 3,920.72 mi (6,309.78 km) |
| Gahanna to Oloron-Sainte-Marie | 4,074.76 mi (6,557.69 km) |
| Gahanna to Onet Village | 4,177.29 mi (6,722.69 km) |
| Gahanna to Onnaing | 4,027.64 mi (6,481.86 km) |
| Gahanna to Orange | 4,280.63 mi (6,889.00 km) |
| Gahanna to Orchies | 4,011.01 mi (6,455.09 km) |
| Gahanna to Orleans | 4,035.12 mi (6,493.89 km) |
| Gahanna to Orly | 4,029.22 mi (6,484.41 km) |
| Gahanna to Ormesson-sur-Marne | 4,033.88 mi (6,491.91 km) |
| Gahanna to Orsay | 4,022.23 mi (6,473.15 km) |
