| Penarth to Opole | 914.99 mi (1,472.53 km) |
| Penarth to Orzesze | 957.89 mi (1,541.57 km) |
| Penarth to Osowa | 920.86 mi (1,481.98 km) |
| Penarth to Ostroda | 979.78 mi (1,576.81 km) |
| Penarth to Ostroleka | 1,047.21 mi (1,685.31 km) |
| Penarth to Ostrow Mazowiecka | 1,062.45 mi (1,709.84 km) |
| Penarth to Ostrow Wielkopolski | 898.89 mi (1,446.63 km) |
| Penarth to Ostrowiec Swietokrzyski | 1,059.72 mi (1,705.45 km) |
| Penarth to Ostrzeszow | 906.06 mi (1,458.16 km) |
| Penarth to Oswiecim | 980.03 mi (1,577.21 km) |
| Penarth to Otwock | 1,040.88 mi (1,675.13 km) |
| Penarth to Ozarow Mazowiecki | 1,020.42 mi (1,642.21 km) |
| Penarth to Ozimek | 926.91 mi (1,491.71 km) |
| Penarth to Ozorkow | 958.43 mi (1,542.45 km) |
| Penarth to Pabianice | 965.46 mi (1,553.76 km) |
