| Calne to Opole | 864.93 mi (1,391.97 km) |
| Calne to Orzesze | 907.75 mi (1,460.88 km) |
| Calne to Osowa | 873.99 mi (1,406.55 km) |
| Calne to Ostroda | 931.96 mi (1,499.84 km) |
| Calne to Ostroleka | 998.77 mi (1,607.37 km) |
| Calne to Ostrow Mazowiecka | 1,013.80 mi (1,631.55 km) |
| Calne to Ostrow Wielkopolski | 849.24 mi (1,366.72 km) |
| Calne to Ostrowiec Swietokrzyski | 1,009.90 mi (1,625.27 km) |
| Calne to Ostrzeszow | 856.29 mi (1,378.06 km) |
| Calne to Oswiecim | 929.88 mi (1,496.51 km) |
| Calne to Otwock | 991.68 mi (1,595.96 km) |
| Calne to Ozarow Mazowiecki | 971.27 mi (1,563.11 km) |
| Calne to Ozimek | 876.86 mi (1,411.17 km) |
| Calne to Ozorkow | 909.04 mi (1,462.97 km) |
| Calne to Pabianice | 915.88 mi (1,473.97 km) |
