| Watertown to Oberkirch | 3,816.62 mi (6,142.26 km) |
| Watertown to Obernburg am Main | 3,814.13 mi (6,138.25 km) |
| Watertown to Obernkirchen | 3,733.44 mi (6,008.39 km) |
| Watertown to Oberschleissheim | 3,964.37 mi (6,380.04 km) |
| Watertown to Oberstdorf | 3,943.49 mi (6,346.43 km) |
| Watertown to Obertraubling | 3,962.05 mi (6,376.31 km) |
| Watertown to Obertshausen | 3,794.55 mi (6,106.74 km) |
| Watertown to Oberursel | 3,780.06 mi (6,083.42 km) |
| Watertown to Ochsenfurt | 3,856.55 mi (6,206.52 km) |
| Watertown to Ochsenhausen | 3,906.77 mi (6,287.34 km) |
| Watertown to Ochtrup | 3,662.75 mi (5,894.63 km) |
| Watertown to Odenthal | 3,696.63 mi (5,949.15 km) |
| Watertown to Oelde | 3,710.79 mi (5,971.94 km) |
| Watertown to Oelsnitz | 3,910.54 mi (6,293.41 km) |
| Watertown to Oer-Erkenschwick | 3,682.59 mi (5,926.55 km) |
