| Watertown Town to Octeville | 3,254.14 mi (5,237.04 km) |
| Watertown Town to Oignies | 3,427.41 mi (5,515.88 km) |
| Watertown Town to Oissel | 3,376.22 mi (5,433.50 km) |
| Watertown Town to Olivet | 3,448.31 mi (5,549.52 km) |
| Watertown Town to Ollioules | 3,759.97 mi (6,051.10 km) |
| Watertown Town to Olonne-sur-Mer | 3,322.98 mi (5,347.82 km) |
| Watertown Town to Oloron-Sainte-Marie | 3,466.75 mi (5,579.20 km) |
| Watertown Town to Onet Village | 3,576.88 mi (5,756.43 km) |
| Watertown Town to Onnaing | 3,454.24 mi (5,559.07 km) |
| Watertown Town to Orange | 3,682.32 mi (5,926.13 km) |
| Watertown Town to Orchies | 3,437.55 mi (5,532.20 km) |
| Watertown Town to Orleans | 3,447.65 mi (5,548.46 km) |
| Watertown Town to Orly | 3,446.19 mi (5,546.11 km) |
| Watertown Town to Ormesson-sur-Marne | 3,451.24 mi (5,554.24 km) |
| Watertown Town to Orsay | 3,438.70 mi (5,534.06 km) |
