| Reguengos de Monsaraz to Opole | 1,500.98 mi (2,415.59 km) |
| Reguengos de Monsaraz to Orzesze | 1,519.89 mi (2,446.02 km) |
| Reguengos de Monsaraz to Osowa | 1,643.36 mi (2,644.74 km) |
| Reguengos de Monsaraz to Ostroda | 1,671.05 mi (2,689.30 km) |
| Reguengos de Monsaraz to Ostroleka | 1,710.84 mi (2,753.33 km) |
| Reguengos de Monsaraz to Ostrow Mazowiecka | 1,716.01 mi (2,761.65 km) |
| Reguengos de Monsaraz to Ostrow Wielkopolski | 1,525.81 mi (2,455.55 km) |
| Reguengos de Monsaraz to Ostrowiec Swietokrzyski | 1,647.94 mi (2,652.11 km) |
| Reguengos de Monsaraz to Ostrzeszow | 1,523.13 mi (2,451.25 km) |
| Reguengos de Monsaraz to Oswiecim | 1,536.44 mi (2,472.67 km) |
| Reguengos de Monsaraz to Otwock | 1,672.85 mi (2,692.20 km) |
| Reguengos de Monsaraz to Ozarow Mazowiecki | 1,657.45 mi (2,667.41 km) |
| Reguengos de Monsaraz to Ozimek | 1,512.33 mi (2,433.86 km) |
| Reguengos de Monsaraz to Ozorkow | 1,591.73 mi (2,561.64 km) |
| Reguengos de Monsaraz to Pabianice | 1,586.35 mi (2,552.98 km) |
