| Opoczno to Oerlinghausen | 499.04 mi (803.13 km) |
| Opoczno to Oestrich-Winkel | 545.51 mi (877.91 km) |
| Opoczno to Offenburg | 584.30 mi (940.35 km) |
| Opoczno to Oftersheim | 533.33 mi (858.31 km) |
| Opoczno to Ohrdruf | 415.94 mi (669.40 km) |
| Opoczno to Ohringen | 498.84 mi (802.81 km) |
| Opoczno to Olbernhau | 306.05 mi (492.54 km) |
| Opoczno to Olching | 455.96 mi (733.79 km) |
| Opoczno to Oldenburg | 524.26 mi (843.72 km) |
| Opoczno to Oldenburg in Holstein | 440.90 mi (709.56 km) |
| Opoczno to Olfen | 554.20 mi (891.91 km) |
| Opoczno to Olpe | 539.13 mi (867.64 km) |
| Opoczno to Olsberg | 508.66 mi (818.61 km) |
| Opoczno to Oranienburg | 314.05 mi (505.42 km) |
| Opoczno to Ortenberg | 494.33 mi (795.55 km) |
