| Middelkerke to Orzesze | 699.92 mi (1,126.41 km) |
| Middelkerke to Osowa | 689.32 mi (1,109.36 km) |
| Middelkerke to Ostroda | 740.82 mi (1,192.23 km) |
| Middelkerke to Ostroleka | 803.40 mi (1,292.95 km) |
| Middelkerke to Ostrow Mazowiecka | 816.96 mi (1,314.77 km) |
| Middelkerke to Ostrow Wielkopolski | 645.89 mi (1,039.45 km) |
| Middelkerke to Ostrowiec Swietokrzyski | 804.94 mi (1,295.42 km) |
| Middelkerke to Ostrzeszow | 651.96 mi (1,049.23 km) |
| Middelkerke to Oswiecim | 721.98 mi (1,161.91 km) |
| Middelkerke to Otwock | 791.30 mi (1,273.47 km) |
| Middelkerke to Ozarow Mazowiecki | 771.26 mi (1,241.23 km) |
| Middelkerke to Ozimek | 670.08 mi (1,078.39 km) |
| Middelkerke to Ozorkow | 707.51 mi (1,138.62 km) |
| Middelkerke to Pabianice | 712.93 mi (1,147.35 km) |
| Middelkerke to Parczew | 861.84 mi (1,386.99 km) |
