| Watertown Town to Oberkirch | 3,689.93 mi (5,938.36 km) |
| Watertown Town to Obernburg am Main | 3,694.81 mi (5,946.22 km) |
| Watertown Town to Obernkirchen | 3,625.23 mi (5,834.25 km) |
| Watertown Town to Oberschleissheim | 3,841.84 mi (6,182.84 km) |
| Watertown Town to Oberstdorf | 3,815.35 mi (6,140.22 km) |
| Watertown Town to Obertraubling | 3,843.52 mi (6,185.55 km) |
| Watertown Town to Obertshausen | 3,675.80 mi (5,915.63 km) |
| Watertown Town to Oberursel | 3,661.55 mi (5,892.69 km) |
| Watertown Town to Ochsenfurt | 3,737.77 mi (6,015.35 km) |
| Watertown Town to Ochsenhausen | 3,780.93 mi (6,084.82 km) |
| Watertown Town to Ochtrup | 3,551.65 mi (5,715.83 km) |
| Watertown Town to Odenthal | 3,579.87 mi (5,761.25 km) |
| Watertown Town to Oelde | 3,599.21 mi (5,792.37 km) |
| Watertown Town to Oelsnitz | 3,798.32 mi (6,112.81 km) |
| Watertown Town to Oer-Erkenschwick | 3,568.88 mi (5,743.56 km) |
