| Harlingen to Orzesze | 606.91 mi (976.73 km) |
| Harlingen to Osowa | 538.46 mi (866.56 km) |
| Harlingen to Ostroda | 598.49 mi (963.18 km) |
| Harlingen to Ostroleka | 667.86 mi (1,074.81 km) |
| Harlingen to Ostrow Mazowiecka | 684.14 mi (1,101.02 km) |
| Harlingen to Ostrow Wielkopolski | 531.95 mi (856.09 km) |
| Harlingen to Ostrowiec Swietokrzyski | 694.48 mi (1,117.66 km) |
| Harlingen to Ostrzeszow | 541.47 mi (871.41 km) |
| Harlingen to Oswiecim | 629.10 mi (1,012.44 km) |
| Harlingen to Otwock | 666.64 mi (1,072.86 km) |
| Harlingen to Ozarow Mazowiecki | 645.85 mi (1,039.39 km) |
| Harlingen to Ozimek | 570.64 mi (918.36 km) |
| Harlingen to Ozorkow | 586.87 mi (944.47 km) |
| Harlingen to Pabianice | 596.53 mi (960.02 km) |
| Harlingen to Parczew | 740.90 mi (1,192.37 km) |
