| Grudziadz to Opwijk | 639.54 mi (1,029.24 km) |
| Grudziadz to Ostend | 684.71 mi (1,101.93 km) |
| Grudziadz to Oud-Heverlee | 623.46 mi (1,003.36 km) |
| Grudziadz to Oud-Turnhout | 598.55 mi (963.28 km) |
| Grudziadz to Oudenaarde | 666.13 mi (1,072.04 km) |
| Grudziadz to Oudenburg | 682.40 mi (1,098.22 km) |
| Grudziadz to Oupeye | 587.71 mi (945.82 km) |
| Grudziadz to Overijse | 630.17 mi (1,014.16 km) |
| Grudziadz to Overpelt | 583.39 mi (938.87 km) |
| Grudziadz to Paal | 597.69 mi (961.89 km) |
| Grudziadz to Peer | 583.98 mi (939.82 km) |
| Grudziadz to Pepinster | 584.88 mi (941.27 km) |
| Grudziadz to Peruwelz | 675.68 mi (1,087.40 km) |
| Grudziadz to Perwez | 623.20 mi (1,002.95 km) |
| Grudziadz to Philippeville | 646.15 mi (1,039.88 km) |
