| Penarth to Oerlinghausen | 507.69 mi (817.04 km) |
| Penarth to Oestrich-Winkel | 498.03 mi (801.51 km) |
| Penarth to Offenburg | 533.74 mi (858.98 km) |
| Penarth to Oftersheim | 536.23 mi (862.97 km) |
| Penarth to Ohrdruf | 603.36 mi (971.01 km) |
| Penarth to Ohringen | 579.02 mi (931.84 km) |
| Penarth to Olbernhau | 717.25 mi (1,154.31 km) |
| Penarth to Olching | 681.96 mi (1,097.51 km) |
| Penarth to Oldenburg | 494.91 mi (796.48 km) |
| Penarth to Oldenburg in Holstein | 617.57 mi (993.88 km) |
| Penarth to Olfen | 453.22 mi (729.39 km) |
| Penarth to Olpe | 476.54 mi (766.92 km) |
| Penarth to Olsberg | 501.94 mi (807.79 km) |
| Penarth to Oranienburg | 700.90 mi (1,127.99 km) |
| Penarth to Ortenberg | 537.30 mi (864.71 km) |
