| Omurtag to Opwijk | 1,173.30 mi (1,888.25 km) |
| Omurtag to Ostend | 1,230.99 mi (1,981.09 km) |
| Omurtag to Oud-Heverlee | 1,150.38 mi (1,851.36 km) |
| Omurtag to Oud-Turnhout | 1,149.02 mi (1,849.17 km) |
| Omurtag to Oudenaarde | 1,194.89 mi (1,922.99 km) |
| Omurtag to Oudenburg | 1,226.77 mi (1,974.29 km) |
| Omurtag to Oupeye | 1,107.31 mi (1,782.04 km) |
| Omurtag to Overijse | 1,154.76 mi (1,858.41 km) |
| Omurtag to Overpelt | 1,129.05 mi (1,817.04 km) |
| Omurtag to Paal | 1,134.51 mi (1,825.81 km) |
| Omurtag to Peer | 1,125.44 mi (1,811.23 km) |
| Omurtag to Pepinster | 1,096.79 mi (1,765.12 km) |
| Omurtag to Peruwelz | 1,188.78 mi (1,913.15 km) |
| Omurtag to Perwez | 1,139.55 mi (1,833.92 km) |
| Omurtag to Philippeville | 1,141.65 mi (1,837.31 km) |
