| Rio Maior to Opole | 1,515.83 mi (2,439.49 km) |
| Rio Maior to Orzesze | 1,537.77 mi (2,474.80 km) |
| Rio Maior to Osowa | 1,643.95 mi (2,645.69 km) |
| Rio Maior to Ostroda | 1,676.09 mi (2,697.41 km) |
| Rio Maior to Ostroleka | 1,719.89 mi (2,767.90 km) |
| Rio Maior to Ostrow Mazowiecka | 1,726.37 mi (2,778.33 km) |
| Rio Maior to Ostrow Wielkopolski | 1,536.44 mi (2,472.66 km) |
| Rio Maior to Ostrowiec Swietokrzyski | 1,665.06 mi (2,679.66 km) |
| Rio Maior to Ostrzeszow | 1,534.85 mi (2,470.11 km) |
| Rio Maior to Oswiecim | 1,555.25 mi (2,502.94 km) |
| Rio Maior to Otwock | 1,685.24 mi (2,712.13 km) |
| Rio Maior to Ozarow Mazowiecki | 1,669.01 mi (2,686.01 km) |
| Rio Maior to Ozimek | 1,527.46 mi (2,458.21 km) |
| Rio Maior to Ozorkow | 1,602.72 mi (2,579.34 km) |
| Rio Maior to Pabianice | 1,598.72 mi (2,572.89 km) |
