| Cave Spring to Orbetello | 4,607.77 mi (7,415.50 km) |
| Cave Spring to Oria | 4,960.70 mi (7,983.48 km) |
| Cave Spring to Oristano | 4,576.21 mi (7,364.69 km) |
| Cave Spring to Orta Nova | 4,845.31 mi (7,797.77 km) |
| Cave Spring to Orte | 4,658.76 mi (7,497.54 km) |
| Cave Spring to Ortona | 4,750.71 mi (7,645.53 km) |
| Cave Spring to Orvieto | 4,637.64 mi (7,463.55 km) |
| Cave Spring to Orzinuovi | 4,452.96 mi (7,166.35 km) |
| Cave Spring to Osimo | 4,670.50 mi (7,516.44 km) |
| Cave Spring to Ospitaletto | 4,453.90 mi (7,167.86 km) |
| Cave Spring to Ostuni | 4,949.56 mi (7,965.55 km) |
| Cave Spring to Ottaviano | 4,808.81 mi (7,739.04 km) |
| Cave Spring to Ovada | 4,421.95 mi (7,116.44 km) |
| Cave Spring to Ozieri | 4,571.97 mi (7,357.87 km) |
| Cave Spring to Paceco | 4,826.90 mi (7,768.15 km) |
