| Gretz-Armainvilliers to Opwijk | 166.77 mi (268.38 km) |
| Gretz-Armainvilliers to Ostend | 171.87 mi (276.60 km) |
| Gretz-Armainvilliers to Oud-Heverlee | 168.30 mi (270.85 km) |
| Gretz-Armainvilliers to Oud-Turnhout | 204.02 mi (328.34 km) |
| Gretz-Armainvilliers to Oudenaarde | 150.74 mi (242.59 km) |
| Gretz-Armainvilliers to Oudenburg | 169.15 mi (272.22 km) |
| Gretz-Armainvilliers to Oupeye | 188.00 mi (302.56 km) |
| Gretz-Armainvilliers to Overijse | 162.34 mi (261.26 km) |
| Gretz-Armainvilliers to Overpelt | 208.45 mi (335.46 km) |
| Gretz-Armainvilliers to Paal | 192.32 mi (309.51 km) |
| Gretz-Armainvilliers to Peer | 204.74 mi (329.50 km) |
| Gretz-Armainvilliers to Pepinster | 186.85 mi (300.70 km) |
| Gretz-Armainvilliers to Peruwelz | 128.43 mi (206.69 km) |
| Gretz-Armainvilliers to Perwez | 159.92 mi (257.37 km) |
| Gretz-Armainvilliers to Philippeville | 129.64 mi (208.63 km) |
