| Opmeer to Orzesze | 618.98 mi (996.15 km) |
| Opmeer to Osowa | 566.59 mi (911.83 km) |
| Opmeer to Ostroda | 624.16 mi (1,004.49 km) |
| Opmeer to Ostroleka | 691.72 mi (1,113.22 km) |
| Opmeer to Ostrow Mazowiecka | 707.27 mi (1,138.24 km) |
| Opmeer to Ostrow Wielkopolski | 549.23 mi (883.90 km) |
| Opmeer to Ostrowiec Swietokrzyski | 711.51 mi (1,145.06 km) |
| Opmeer to Ostrzeszow | 557.85 mi (897.78 km) |
| Opmeer to Oswiecim | 641.25 mi (1,031.99 km) |
| Opmeer to Otwock | 687.43 mi (1,106.32 km) |
| Opmeer to Ozarow Mazowiecki | 666.79 mi (1,073.09 km) |
| Opmeer to Ozimek | 584.21 mi (940.19 km) |
| Opmeer to Ozorkow | 606.27 mi (975.69 km) |
| Opmeer to Pabianice | 614.80 mi (989.42 km) |
| Opmeer to Parczew | 760.88 mi (1,224.52 km) |
