| Tonypandy to Oberkirch | 553.42 mi (890.64 km) |
| Tonypandy to Obernburg am Main | 563.55 mi (906.94 km) |
| Tonypandy to Obernkirchen | 536.49 mi (863.40 km) |
| Tonypandy to Oberschleissheim | 705.81 mi (1,135.89 km) |
| Tonypandy to Oberstdorf | 679.81 mi (1,094.05 km) |
| Tonypandy to Obertraubling | 711.86 mi (1,145.62 km) |
| Tonypandy to Obertshausen | 545.92 mi (878.57 km) |
| Tonypandy to Oberursel | 532.44 mi (856.87 km) |
| Tonypandy to Ochsenfurt | 606.90 mi (976.70 km) |
| Tonypandy to Ochsenhausen | 644.21 mi (1,036.76 km) |
| Tonypandy to Ochtrup | 454.91 mi (732.11 km) |
| Tonypandy to Odenthal | 457.66 mi (736.54 km) |
| Tonypandy to Oelde | 496.18 mi (798.52 km) |
| Tonypandy to Oelsnitz | 682.57 mi (1,098.49 km) |
| Tonypandy to Oer-Erkenschwick | 458.56 mi (737.99 km) |
