| Penarth to Oberkirch | 537.85 mi (865.58 km) |
| Penarth to Obernburg am Main | 549.89 mi (884.97 km) |
| Penarth to Obernkirchen | 527.00 mi (848.12 km) |
| Penarth to Oberschleissheim | 691.03 mi (1,112.10 km) |
| Penarth to Oberstdorf | 663.95 mi (1,068.53 km) |
| Penarth to Obertraubling | 697.95 mi (1,123.24 km) |
| Penarth to Obertshausen | 532.50 mi (856.98 km) |
| Penarth to Oberursel | 519.16 mi (835.51 km) |
| Penarth to Ochsenfurt | 593.23 mi (954.72 km) |
| Penarth to Ochsenhausen | 628.80 mi (1,011.95 km) |
| Penarth to Ochtrup | 445.34 mi (716.71 km) |
| Penarth to Odenthal | 445.52 mi (717.00 km) |
| Penarth to Oelde | 485.79 mi (781.81 km) |
| Penarth to Oelsnitz | 670.38 mi (1,078.88 km) |
| Penarth to Oer-Erkenschwick | 447.72 mi (720.54 km) |
