| Dumbarton to Opwijk | 497.43 mi (800.53 km) |
| Dumbarton to Ostend | 447.63 mi (720.40 km) |
| Dumbarton to Oud-Heverlee | 518.56 mi (834.54 km) |
| Dumbarton to Oud-Turnhout | 504.76 mi (812.34 km) |
| Dumbarton to Oudenaarde | 486.57 mi (783.05 km) |
| Dumbarton to Oudenburg | 452.13 mi (727.63 km) |
| Dumbarton to Oupeye | 554.58 mi (892.51 km) |
| Dumbarton to Overijse | 517.09 mi (832.18 km) |
| Dumbarton to Overpelt | 523.21 mi (842.02 km) |
| Dumbarton to Paal | 523.93 mi (843.19 km) |
| Dumbarton to Peer | 528.31 mi (850.24 km) |
| Dumbarton to Pepinster | 566.87 mi (912.29 km) |
| Dumbarton to Peruwelz | 503.85 mi (810.87 km) |
| Dumbarton to Perwez | 533.54 mi (858.65 km) |
| Dumbarton to Philippeville | 547.81 mi (881.61 km) |
