| Altamont to Opwijk | 5,225.73 mi (8,410.01 km) |
| Altamont to Ostend | 5,177.47 mi (8,332.33 km) |
| Altamont to Oud-Heverlee | 5,245.99 mi (8,442.60 km) |
| Altamont to Oud-Turnhout | 5,228.06 mi (8,413.75 km) |
| Altamont to Oudenaarde | 5,216.24 mi (8,394.73 km) |
| Altamont to Oudenburg | 5,181.95 mi (8,339.54 km) |
| Altamont to Oupeye | 5,278.86 mi (8,495.51 km) |
| Altamont to Overijse | 5,245.12 mi (8,441.21 km) |
| Altamont to Overpelt | 5,244.97 mi (8,440.97 km) |
| Altamont to Paal | 5,248.25 mi (8,446.24 km) |
| Altamont to Peer | 5,250.55 mi (8,449.94 km) |
| Altamont to Pepinster | 5,291.26 mi (8,515.46 km) |
| Altamont to Peruwelz | 5,233.78 mi (8,422.96 km) |
| Altamont to Perwez | 5,261.38 mi (8,467.37 km) |
| Altamont to Philippeville | 5,277.35 mi (8,493.07 km) |
