| Harelbeke to Orzesze | 678.89 mi (1,092.58 km) |
| Harelbeke to Osowa | 680.01 mi (1,094.38 km) |
| Harelbeke to Ostroda | 728.98 mi (1,173.18 km) |
| Harelbeke to Ostroleka | 789.71 mi (1,270.92 km) |
| Harelbeke to Ostrow Mazowiecka | 802.61 mi (1,291.67 km) |
| Harelbeke to Ostrow Wielkopolski | 628.53 mi (1,011.52 km) |
| Harelbeke to Ostrowiec Swietokrzyski | 786.27 mi (1,265.38 km) |
| Harelbeke to Ostrzeszow | 633.96 mi (1,020.26 km) |
| Harelbeke to Oswiecim | 700.84 mi (1,127.90 km) |
| Harelbeke to Otwock | 775.31 mi (1,247.74 km) |
| Harelbeke to Ozarow Mazowiecki | 755.50 mi (1,215.87 km) |
| Harelbeke to Ozimek | 650.18 mi (1,046.36 km) |
| Harelbeke to Ozorkow | 691.08 mi (1,112.18 km) |
| Harelbeke to Pabianice | 695.68 mi (1,119.59 km) |
| Harelbeke to Parczew | 844.89 mi (1,359.72 km) |
