| Hardenberg to Orzesze | 548.70 mi (883.04 km) |
| Hardenberg to Osowa | 503.21 mi (809.84 km) |
| Hardenberg to Ostroda | 558.06 mi (898.11 km) |
| Hardenberg to Ostroleka | 624.10 mi (1,004.39 km) |
| Hardenberg to Ostrow Mazowiecka | 639.15 mi (1,028.61 km) |
| Hardenberg to Ostrow Wielkopolski | 478.97 mi (770.83 km) |
| Hardenberg to Ostrowiec Swietokrzyski | 641.16 mi (1,031.85 km) |
| Hardenberg to Ostrzeszow | 487.46 mi (784.49 km) |
| Hardenberg to Oswiecim | 570.96 mi (918.87 km) |
| Hardenberg to Otwock | 618.13 mi (994.78 km) |
| Hardenberg to Ozarow Mazowiecki | 597.56 mi (961.68 km) |
| Hardenberg to Ozimek | 513.75 mi (826.80 km) |
| Hardenberg to Ozorkow | 536.50 mi (863.42 km) |
| Hardenberg to Pabianice | 544.71 mi (876.63 km) |
| Hardenberg to Parczew | 691.23 mi (1,112.42 km) |
