| Herceg Novi to Oegstgeest | 938.12 mi (1,509.76 km) |
| Herceg Novi to Oirschot | 880.50 mi (1,417.02 km) |
| Herceg Novi to Oisterwijk | 887.49 mi (1,428.28 km) |
| Herceg Novi to Oldebroek | 905.86 mi (1,457.84 km) |
| Herceg Novi to Oldenzaal | 868.90 mi (1,398.36 km) |
| Herceg Novi to Ommen | 893.89 mi (1,438.58 km) |
| Herceg Novi to Oosterend | 928.37 mi (1,494.07 km) |
| Herceg Novi to Oosterhout | 901.45 mi (1,450.74 km) |
| Herceg Novi to Oosterwolde | 921.32 mi (1,482.73 km) |
| Herceg Novi to Oostzaan | 936.22 mi (1,506.70 km) |
| Herceg Novi to Opmeer | 946.60 mi (1,523.41 km) |
| Herceg Novi to Oss | 885.49 mi (1,425.06 km) |
| Herceg Novi to Oud-Beijerland | 924.19 mi (1,487.34 km) |
| Herceg Novi to Oudenbosch | 910.23 mi (1,464.87 km) |
| Herceg Novi to Oudewater | 917.73 mi (1,476.95 km) |
