| Watertown to Octeville | 3,389.16 mi (5,454.32 km) |
| Watertown to Oignies | 3,552.39 mi (5,717.02 km) |
| Watertown to Oissel | 3,509.10 mi (5,647.35 km) |
| Watertown to Olivet | 3,586.99 mi (5,772.70 km) |
| Watertown to Ollioules | 3,912.69 mi (6,296.86 km) |
| Watertown to Olonne-sur-Mer | 3,472.83 mi (5,588.97 km) |
| Watertown to Oloron-Sainte-Marie | 3,629.40 mi (5,840.96 km) |
| Watertown to Onet Village | 3,729.79 mi (6,002.52 km) |
| Watertown to Onnaing | 3,578.82 mi (5,759.55 km) |
| Watertown to Orange | 3,832.71 mi (6,168.15 km) |
| Watertown to Orchies | 3,562.18 mi (5,732.77 km) |
| Watertown to Orleans | 3,586.14 mi (5,771.34 km) |
| Watertown to Orly | 3,580.14 mi (5,761.67 km) |
| Watertown to Ormesson-sur-Marne | 3,584.79 mi (5,769.16 km) |
| Watertown to Orsay | 3,573.14 mi (5,750.42 km) |
