| Piran to Opole | 408.02 mi (656.64 km) |
| Piran to Orzesze | 399.44 mi (642.83 km) |
| Piran to Osowa | 651.90 mi (1,049.14 km) |
| Piran to Ostroda | 632.51 mi (1,017.92 km) |
| Piran to Ostroleka | 632.54 mi (1,017.97 km) |
| Piran to Ostrow Mazowiecka | 626.92 mi (1,008.93 km) |
| Piran to Ostrow Wielkopolski | 465.16 mi (748.61 km) |
| Piran to Ostrowiec Swietokrzyski | 518.48 mi (834.41 km) |
| Piran to Ostrzeszow | 453.13 mi (729.24 km) |
| Piran to Oswiecim | 407.16 mi (655.26 km) |
| Piran to Otwock | 573.67 mi (923.23 km) |
| Piran to Ozarow Mazowiecki | 566.46 mi (911.63 km) |
| Piran to Ozimek | 414.89 mi (667.70 km) |
| Piran to Ozorkow | 515.07 mi (828.93 km) |
| Piran to Pabianice | 499.17 mi (803.33 km) |
