| Campobasso to Opwijk | 818.40 mi (1,317.09 km) |
| Campobasso to Ostend | 868.89 mi (1,398.34 km) |
| Campobasso to Oud-Heverlee | 797.62 mi (1,283.65 km) |
| Campobasso to Oud-Turnhout | 814.80 mi (1,311.29 km) |
| Campobasso to Oudenaarde | 829.67 mi (1,335.22 km) |
| Campobasso to Oudenburg | 864.35 mi (1,391.03 km) |
| Campobasso to Oupeye | 764.01 mi (1,229.55 km) |
| Campobasso to Overijse | 798.81 mi (1,285.56 km) |
| Campobasso to Overpelt | 797.92 mi (1,284.12 km) |
| Campobasso to Paal | 794.65 mi (1,278.86 km) |
| Campobasso to Peer | 792.32 mi (1,275.12 km) |
| Campobasso to Pepinster | 751.61 mi (1,209.60 km) |
| Campobasso to Peruwelz | 813.68 mi (1,309.48 km) |
| Campobasso to Perwez | 782.43 mi (1,259.19 km) |
| Campobasso to Philippeville | 768.37 mi (1,236.56 km) |
