| Williamsport to Octeville | 3,545.48 mi (5,705.90 km) |
| Williamsport to Oignies | 3,713.82 mi (5,976.82 km) |
| Williamsport to Oissel | 3,666.60 mi (5,900.83 km) |
| Williamsport to Olivet | 3,741.52 mi (6,021.40 km) |
| Williamsport to Ollioules | 4,059.45 mi (6,533.05 km) |
| Williamsport to Olonne-sur-Mer | 3,621.04 mi (5,827.49 km) |
| Williamsport to Oloron-Sainte-Marie | 3,769.79 mi (6,066.89 km) |
| Williamsport to Onet Village | 3,876.33 mi (6,238.36 km) |
| Williamsport to Onnaing | 3,740.46 mi (6,019.69 km) |
| Williamsport to Orange | 3,980.81 mi (6,406.50 km) |
| Williamsport to Orchies | 3,723.78 mi (5,992.85 km) |
| Williamsport to Orleans | 3,740.77 mi (6,020.19 km) |
| Williamsport to Orly | 3,737.14 mi (6,014.35 km) |
| Williamsport to Ormesson-sur-Marne | 3,742.01 mi (6,022.18 km) |
| Williamsport to Orsay | 3,729.89 mi (6,002.68 km) |
