| Ciechanow to Orbetello | 841.80 mi (1,354.74 km) |
| Ciechanow to Oria | 866.01 mi (1,393.70 km) |
| Ciechanow to Oristano | 1,060.48 mi (1,706.67 km) |
| Ciechanow to Orta Nova | 829.49 mi (1,334.94 km) |
| Ciechanow to Orte | 813.79 mi (1,309.66 km) |
| Ciechanow to Ortona | 781.77 mi (1,258.14 km) |
| Ciechanow to Orvieto | 803.81 mi (1,293.61 km) |
| Ciechanow to Orzinuovi | 705.76 mi (1,135.80 km) |
| Ciechanow to Osimo | 726.38 mi (1,169.00 km) |
| Ciechanow to Ospitaletto | 693.16 mi (1,115.53 km) |
| Ciechanow to Ostuni | 850.45 mi (1,368.67 km) |
| Ciechanow to Ottaviano | 878.93 mi (1,414.51 km) |
| Ciechanow to Ovada | 786.25 mi (1,265.35 km) |
| Ciechanow to Ozieri | 1,008.89 mi (1,623.65 km) |
| Ciechanow to Paceco | 1,098.84 mi (1,768.42 km) |
