| Holt to Opwijk | 3,976.17 mi (6,399.03 km) |
| Holt to Ostend | 3,919.51 mi (6,307.85 km) |
| Holt to Oud-Heverlee | 3,999.04 mi (6,435.84 km) |
| Holt to Oud-Turnhout | 3,994.45 mi (6,428.44 km) |
| Holt to Oudenaarde | 3,957.93 mi (6,369.67 km) |
| Holt to Oudenburg | 3,923.98 mi (6,315.04 km) |
| Holt to Oupeye | 4,040.30 mi (6,502.24 km) |
| Holt to Overijse | 3,995.69 mi (6,430.45 km) |
| Holt to Overpelt | 4,014.14 mi (6,460.13 km) |
| Holt to Paal | 4,011.09 mi (6,455.23 km) |
| Holt to Peer | 4,018.42 mi (6,467.02 km) |
| Holt to Pepinster | 4,051.82 mi (6,520.77 km) |
| Holt to Peruwelz | 3,968.52 mi (6,386.72 km) |
| Holt to Perwez | 4,011.86 mi (6,456.46 km) |
| Holt to Philippeville | 4,016.38 mi (6,463.74 km) |
