| Olgiate Comasco to Opwijk | 419.86 mi (675.71 km) |
| Olgiate Comasco to Ostend | 466.61 mi (750.94 km) |
| Olgiate Comasco to Oud-Heverlee | 400.83 mi (645.07 km) |
| Olgiate Comasco to Oud-Turnhout | 423.36 mi (681.33 km) |
| Olgiate Comasco to Oudenaarde | 427.95 mi (688.72 km) |
| Olgiate Comasco to Oudenburg | 462.14 mi (743.74 km) |
| Olgiate Comasco to Oupeye | 372.97 mi (600.24 km) |
| Olgiate Comasco to Overijse | 400.95 mi (645.26 km) |
| Olgiate Comasco to Overpelt | 408.96 mi (658.16 km) |
| Olgiate Comasco to Paal | 402.55 mi (647.84 km) |
| Olgiate Comasco to Peer | 403.03 mi (648.61 km) |
| Olgiate Comasco to Pepinster | 360.88 mi (580.78 km) |
| Olgiate Comasco to Peruwelz | 410.31 mi (660.33 km) |
| Olgiate Comasco to Perwez | 385.11 mi (619.77 km) |
| Olgiate Comasco to Philippeville | 367.05 mi (590.71 km) |
