| Pen-y-Bont ar Ogwr to Oberkirch | 556.22 mi (895.15 km) |
| Pen-y-Bont ar Ogwr to Obernburg am Main | 567.97 mi (914.06 km) |
| Pen-y-Bont ar Ogwr to Obernkirchen | 543.27 mi (874.30 km) |
| Pen-y-Bont ar Ogwr to Oberschleissheim | 709.35 mi (1,141.58 km) |
| Pen-y-Bont ar Ogwr to Oberstdorf | 682.31 mi (1,098.07 km) |
| Pen-y-Bont ar Ogwr to Obertraubling | 716.10 mi (1,152.45 km) |
| Pen-y-Bont ar Ogwr to Obertshausen | 550.51 mi (885.97 km) |
| Pen-y-Bont ar Ogwr to Oberursel | 537.13 mi (864.43 km) |
| Pen-y-Bont ar Ogwr to Ochsenfurt | 611.32 mi (983.82 km) |
| Pen-y-Bont ar Ogwr to Ochsenhausen | 647.17 mi (1,041.52 km) |
| Pen-y-Bont ar Ogwr to Ochtrup | 461.64 mi (742.94 km) |
| Pen-y-Bont ar Ogwr to Odenthal | 463.07 mi (745.24 km) |
| Pen-y-Bont ar Ogwr to Oelde | 502.53 mi (808.75 km) |
| Pen-y-Bont ar Ogwr to Oelsnitz | 687.96 mi (1,107.17 km) |
| Pen-y-Bont ar Ogwr to Oer-Erkenschwick | 464.69 mi (747.84 km) |
