| Crest Hill to Orbetello | 4,767.64 mi (7,672.77 km) |
| Crest Hill to Oria | 5,109.04 mi (8,222.20 km) |
| Crest Hill to Oristano | 4,766.03 mi (7,670.19 km) |
| Crest Hill to Orta Nova | 4,995.61 mi (8,039.65 km) |
| Crest Hill to Orte | 4,813.87 mi (7,747.18 km) |
| Crest Hill to Ortona | 4,898.66 mi (7,883.63 km) |
| Crest Hill to Orvieto | 4,791.82 mi (7,711.69 km) |
| Crest Hill to Orzinuovi | 4,593.82 mi (7,393.04 km) |
| Crest Hill to Osimo | 4,813.34 mi (7,746.32 km) |
| Crest Hill to Ospitaletto | 4,592.97 mi (7,391.68 km) |
| Crest Hill to Ostuni | 5,096.40 mi (8,201.87 km) |
| Crest Hill to Ottaviano | 4,967.81 mi (7,994.92 km) |
| Crest Hill to Ovada | 4,573.75 mi (7,360.74 km) |
| Crest Hill to Ozieri | 4,754.92 mi (7,652.30 km) |
| Crest Hill to Paceco | 5,015.19 mi (8,071.16 km) |
