| Williamstown to Octeville | 3,523.05 mi (5,669.81 km) |
| Williamstown to Oignies | 3,697.54 mi (5,950.62 km) |
| Williamstown to Oissel | 3,645.39 mi (5,866.68 km) |
| Williamstown to Olivet | 3,716.50 mi (5,981.12 km) |
| Williamstown to Ollioules | 4,024.80 mi (6,477.29 km) |
| Williamstown to Olonne-sur-Mer | 3,588.88 mi (5,775.74 km) |
| Williamstown to Oloron-Sainte-Marie | 3,728.82 mi (6,000.95 km) |
| Williamstown to Onet Village | 3,841.79 mi (6,182.76 km) |
| Williamstown to Onnaing | 3,724.41 mi (5,993.87 km) |
| Williamstown to Orange | 3,947.82 mi (6,353.40 km) |
| Williamstown to Orchies | 3,707.72 mi (5,967.00 km) |
| Williamstown to Orleans | 3,715.87 mi (5,980.12 km) |
| Williamstown to Orly | 3,715.17 mi (5,978.98 km) |
| Williamstown to Ormesson-sur-Marne | 3,720.28 mi (5,987.21 km) |
| Williamstown to Orsay | 3,707.61 mi (5,966.82 km) |
