| Groves to Opwijk | 4,967.02 mi (7,993.65 km) |
| Groves to Ostend | 4,909.75 mi (7,901.49 km) |
| Groves to Oud-Heverlee | 4,990.00 mi (8,030.63 km) |
| Groves to Oud-Turnhout | 4,987.76 mi (8,027.03 km) |
| Groves to Oudenaarde | 4,947.50 mi (7,962.23 km) |
| Groves to Oudenburg | 4,914.15 mi (7,908.56 km) |
| Groves to Oupeye | 5,032.09 mi (8,098.36 km) |
| Groves to Overijse | 4,986.26 mi (8,024.61 km) |
| Groves to Overpelt | 5,007.63 mi (8,059.00 km) |
| Groves to Paal | 5,003.56 mi (8,052.45 km) |
| Groves to Peer | 5,011.63 mi (8,065.44 km) |
| Groves to Pepinster | 5,043.27 mi (8,116.37 km) |
| Groves to Peruwelz | 4,956.63 mi (7,976.93 km) |
| Groves to Perwez | 5,002.16 mi (8,050.19 km) |
| Groves to Philippeville | 5,004.52 mi (8,053.99 km) |
