| Truro to Oberkirch | 601.70 mi (968.34 km) |
| Truro to Obernburg am Main | 629.38 mi (1,012.88 km) |
| Truro to Obernkirchen | 626.97 mi (1,009.02 km) |
| Truro to Oberschleissheim | 760.49 mi (1,223.88 km) |
| Truro to Oberstdorf | 723.01 mi (1,163.57 km) |
| Truro to Obertraubling | 774.24 mi (1,246.01 km) |
| Truro to Obertshausen | 613.79 mi (987.80 km) |
| Truro to Oberursel | 601.50 mi (968.02 km) |
| Truro to Ochsenfurt | 672.20 mi (1,081.80 km) |
| Truro to Ochsenhausen | 693.00 mi (1,115.27 km) |
| Truro to Ochtrup | 545.66 mi (878.15 km) |
| Truro to Odenthal | 535.15 mi (861.23 km) |
| Truro to Oelde | 582.79 mi (937.90 km) |
| Truro to Oelsnitz | 757.66 mi (1,219.34 km) |
| Truro to Oer-Erkenschwick | 543.24 mi (874.25 km) |
