| Guichen to Oria | 1,087.16 mi (1,749.61 km) |
| Guichen to Oristano | 758.49 mi (1,220.66 km) |
| Guichen to Orta Nova | 971.94 mi (1,564.18 km) |
| Guichen to Orte | 786.46 mi (1,265.68 km) |
| Guichen to Ortona | 876.99 mi (1,411.39 km) |
| Guichen to Orvieto | 764.93 mi (1,231.03 km) |
| Guichen to Orzinuovi | 582.85 mi (938.01 km) |
| Guichen to Osimo | 797.66 mi (1,283.71 km) |
| Guichen to Ospitaletto | 585.26 mi (941.89 km) |
| Guichen to Ostuni | 1,075.87 mi (1,731.45 km) |
| Guichen to Ottaviano | 938.93 mi (1,511.06 km) |
| Guichen to Ovada | 548.29 mi (882.38 km) |
| Guichen to Ozieri | 737.30 mi (1,186.57 km) |
| Guichen to Paceco | 997.83 mi (1,605.85 km) |
| Guichen to Pachino | 1,156.68 mi (1,861.50 km) |
