| Slovenj Gradec to Nuth | 517.55 mi (832.91 km) |
| Slovenj Gradec to Oegstgeest | 616.90 mi (992.80 km) |
| Slovenj Gradec to Oirschot | 560.78 mi (902.49 km) |
| Slovenj Gradec to Oisterwijk | 567.57 mi (913.41 km) |
| Slovenj Gradec to Oldebroek | 580.76 mi (934.65 km) |
| Slovenj Gradec to Oldenzaal | 542.56 mi (873.16 km) |
| Slovenj Gradec to Ommen | 567.82 mi (913.81 km) |
| Slovenj Gradec to Oosterend | 601.74 mi (968.41 km) |
| Slovenj Gradec to Oosterhout | 582.09 mi (936.79 km) |
| Slovenj Gradec to Oosterwolde | 594.47 mi (956.71 km) |
| Slovenj Gradec to Oostzaan | 613.04 mi (986.60 km) |
| Slovenj Gradec to Opmeer | 622.35 mi (1,001.57 km) |
| Slovenj Gradec to Oss | 563.82 mi (907.37 km) |
| Slovenj Gradec to Oud-Beijerland | 605.02 mi (973.68 km) |
| Slovenj Gradec to Oudenbosch | 592.07 mi (952.84 km) |
