| Grangemouth to Opwijk | 475.86 mi (765.83 km) |
| Grangemouth to Ostend | 427.78 mi (688.45 km) |
| Grangemouth to Oud-Heverlee | 496.51 mi (799.06 km) |
| Grangemouth to Oud-Turnhout | 481.13 mi (774.30 km) |
| Grangemouth to Oudenaarde | 466.32 mi (750.47 km) |
| Grangemouth to Oudenburg | 432.22 mi (695.60 km) |
| Grangemouth to Oupeye | 531.36 mi (855.15 km) |
| Grangemouth to Overijse | 495.37 mi (797.23 km) |
| Grangemouth to Overpelt | 499.20 mi (803.38 km) |
| Grangemouth to Paal | 500.66 mi (805.73 km) |
| Grangemouth to Peer | 504.44 mi (811.82 km) |
| Grangemouth to Pepinster | 543.71 mi (875.02 km) |
| Grangemouth to Peruwelz | 484.42 mi (779.59 km) |
| Grangemouth to Perwez | 511.73 mi (823.54 km) |
| Grangemouth to Philippeville | 527.33 mi (848.66 km) |
