| Castel Gandolfo to Orzesze | 649.79 mi (1,045.74 km) |
| Castel Gandolfo to Osowa | 915.58 mi (1,473.49 km) |
| Castel Gandolfo to Ostroda | 891.99 mi (1,435.51 km) |
| Castel Gandolfo to Ostroleka | 884.72 mi (1,423.82 km) |
| Castel Gandolfo to Ostrow Mazowiecka | 876.55 mi (1,410.67 km) |
| Castel Gandolfo to Ostrow Wielkopolski | 726.18 mi (1,168.68 km) |
| Castel Gandolfo to Ostrowiec Swietokrzyski | 758.43 mi (1,220.57 km) |
| Castel Gandolfo to Ostrzeszow | 713.17 mi (1,147.74 km) |
| Castel Gandolfo to Oswiecim | 653.60 mi (1,051.87 km) |
| Castel Gandolfo to Otwock | 822.43 mi (1,323.57 km) |
| Castel Gandolfo to Ozarow Mazowiecki | 817.84 mi (1,316.18 km) |
| Castel Gandolfo to Ozimek | 671.14 mi (1,080.10 km) |
| Castel Gandolfo to Ozorkow | 771.73 mi (1,241.98 km) |
| Castel Gandolfo to Pabianice | 754.16 mi (1,213.70 km) |
| Castel Gandolfo to Parczew | 835.52 mi (1,344.65 km) |
