| Glencullen to Opwijk | 467.63 mi (752.58 km) |
| Glencullen to Ostend | 410.19 mi (660.13 km) |
| Glencullen to Oud-Heverlee | 490.62 mi (789.58 km) |
| Glencullen to Oud-Turnhout | 490.92 mi (790.05 km) |
| Glencullen to Oudenaarde | 447.81 mi (720.69 km) |
| Glencullen to Oudenburg | 414.55 mi (667.16 km) |
| Glencullen to Oupeye | 533.16 mi (858.03 km) |
| Glencullen to Overijse | 486.72 mi (783.31 km) |
| Glencullen to Overpelt | 510.89 mi (822.19 km) |
| Glencullen to Paal | 505.42 mi (813.39 km) |
| Glencullen to Peer | 514.42 mi (827.88 km) |
| Glencullen to Pepinster | 544.08 mi (875.62 km) |
| Glencullen to Peruwelz | 457.47 mi (736.23 km) |
| Glencullen to Perwez | 502.53 mi (808.74 km) |
| Glencullen to Philippeville | 505.36 mi (813.31 km) |
