| Sierre to Opole | 563.03 mi (906.11 km) |
| Sierre to Orzesze | 579.99 mi (933.40 km) |
| Sierre to Osowa | 738.38 mi (1,188.31 km) |
| Sierre to Ostroda | 750.60 mi (1,207.98 km) |
| Sierre to Ostroleka | 780.16 mi (1,255.55 km) |
| Sierre to Ostrow Mazowiecka | 782.88 mi (1,259.93 km) |
| Sierre to Ostrow Wielkopolski | 594.13 mi (956.16 km) |
| Sierre to Ostrowiec Swietokrzyski | 708.17 mi (1,139.69 km) |
| Sierre to Ostrzeszow | 589.41 mi (948.57 km) |
| Sierre to Oswiecim | 596.44 mi (959.88 km) |
| Sierre to Otwock | 736.95 mi (1,186.01 km) |
| Sierre to Ozarow Mazowiecki | 722.84 mi (1,163.30 km) |
| Sierre to Ozimek | 574.06 mi (923.86 km) |
| Sierre to Ozorkow | 658.59 mi (1,059.90 km) |
| Sierre to Pabianice | 651.03 mi (1,047.72 km) |
