| Ciechanow to Opwijk | 711.58 mi (1,145.18 km) |
| Ciechanow to Ostend | 759.23 mi (1,221.86 km) |
| Ciechanow to Oud-Heverlee | 694.25 mi (1,117.29 km) |
| Ciechanow to Oud-Turnhout | 671.54 mi (1,080.74 km) |
| Ciechanow to Oudenaarde | 738.24 mi (1,188.09 km) |
| Ciechanow to Oudenburg | 756.66 mi (1,217.72 km) |
| Ciechanow to Oupeye | 656.49 mi (1,056.52 km) |
| Ciechanow to Overijse | 700.86 mi (1,127.92 km) |
| Ciechanow to Overpelt | 655.36 mi (1,054.70 km) |
| Ciechanow to Paal | 668.97 mi (1,076.60 km) |
| Ciechanow to Peer | 655.44 mi (1,054.83 km) |
| Ciechanow to Pepinster | 652.56 mi (1,050.19 km) |
| Ciechanow to Peruwelz | 746.18 mi (1,200.86 km) |
| Ciechanow to Perwez | 692.67 mi (1,114.75 km) |
| Ciechanow to Philippeville | 713.70 mi (1,148.59 km) |
