| Watertown to Opole | 4,115.95 mi (6,623.99 km) |
| Watertown to Orzesze | 4,165.73 mi (6,704.09 km) |
| Watertown to Osowa | 3,994.08 mi (6,427.84 km) |
| Watertown to Ostroda | 4,072.26 mi (6,553.66 km) |
| Watertown to Ostroleka | 4,151.39 mi (6,681.01 km) |
| Watertown to Ostrow Mazowiecka | 4,173.30 mi (6,716.27 km) |
| Watertown to Ostrow Wielkopolski | 4,074.40 mi (6,557.12 km) |
| Watertown to Ostrowiec Swietokrzyski | 4,230.20 mi (6,807.86 km) |
| Watertown to Ostrzeszow | 4,087.40 mi (6,578.04 km) |
| Watertown to Oswiecim | 4,187.33 mi (6,738.85 km) |
| Watertown to Otwock | 4,178.43 mi (6,724.53 km) |
| Watertown to Ozarow Mazowiecki | 4,158.23 mi (6,692.03 km) |
| Watertown to Ozimek | 4,125.90 mi (6,640.00 km) |
| Watertown to Ozorkow | 4,114.64 mi (6,621.88 km) |
| Watertown to Pabianice | 4,130.38 mi (6,647.21 km) |
