| Opoczno to Oberkirch | 576.14 mi (927.21 km) |
| Opoczno to Obernburg am Main | 499.58 mi (804.00 km) |
| Opoczno to Obernkirchen | 480.45 mi (773.21 km) |
| Opoczno to Oberschleissheim | 444.38 mi (715.16 km) |
| Opoczno to Oberstdorf | 526.29 mi (846.98 km) |
| Opoczno to Obertraubling | 395.80 mi (636.97 km) |
| Opoczno to Obertshausen | 508.57 mi (818.46 km) |
| Opoczno to Oberursel | 517.28 mi (832.49 km) |
| Opoczno to Ochsenfurt | 464.19 mi (747.04 km) |
| Opoczno to Ochsenhausen | 514.54 mi (828.08 km) |
| Opoczno to Ochtrup | 561.84 mi (904.19 km) |
| Opoczno to Odenthal | 569.85 mi (917.09 km) |
| Opoczno to Oelde | 521.17 mi (838.74 km) |
| Opoczno to Oelsnitz | 359.84 mi (579.10 km) |
| Opoczno to Oer-Erkenschwick | 560.14 mi (901.46 km) |
