| Opwijk to Orzesze | 640.83 mi (1,031.31 km) |
| Opwijk to Osowa | 642.83 mi (1,034.54 km) |
| Opwijk to Ostroda | 690.99 mi (1,112.04 km) |
| Opwijk to Ostroleka | 751.31 mi (1,209.12 km) |
| Opwijk to Ostrow Mazowiecka | 764.11 mi (1,229.72 km) |
| Opwijk to Ostrow Wielkopolski | 589.87 mi (949.30 km) |
| Opwijk to Ostrowiec Swietokrzyski | 747.72 mi (1,203.34 km) |
| Opwijk to Ostrzeszow | 595.34 mi (958.10 km) |
| Opwijk to Oswiecim | 662.81 mi (1,066.70 km) |
| Opwijk to Otwock | 736.67 mi (1,185.55 km) |
| Opwijk to Ozarow Mazowiecki | 716.87 mi (1,153.70 km) |
| Opwijk to Ozimek | 611.82 mi (984.63 km) |
| Opwijk to Ozorkow | 652.42 mi (1,049.96 km) |
| Opwijk to Pabianice | 657.02 mi (1,057.38 km) |
| Opwijk to Parczew | 806.23 mi (1,297.50 km) |
