| Hrastnik to Oerlinghausen | 497.45 mi (800.57 km) |
| Hrastnik to Oestrich-Winkel | 423.80 mi (682.05 km) |
| Hrastnik to Offenburg | 374.05 mi (601.98 km) |
| Hrastnik to Oftersheim | 377.47 mi (607.47 km) |
| Hrastnik to Ohrdruf | 381.33 mi (613.70 km) |
| Hrastnik to Ohringen | 336.94 mi (542.25 km) |
| Hrastnik to Olbernhau | 323.15 mi (520.06 km) |
| Hrastnik to Olching | 229.22 mi (368.90 km) |
| Hrastnik to Oldenburg | 573.88 mi (923.57 km) |
| Hrastnik to Oldenburg in Holstein | 593.76 mi (955.56 km) |
| Hrastnik to Olfen | 521.37 mi (839.06 km) |
| Hrastnik to Olpe | 474.01 mi (762.84 km) |
| Hrastnik to Olsberg | 470.26 mi (756.81 km) |
| Hrastnik to Oranienburg | 464.46 mi (747.48 km) |
| Hrastnik to Ortenberg | 403.75 mi (649.77 km) |
