| Circleville to Orbetello | 4,636.30 mi (7,461.41 km) |
| Circleville to Oria | 4,984.79 mi (8,022.25 km) |
| Circleville to Oristano | 4,618.41 mi (7,432.61 km) |
| Circleville to Orta Nova | 4,870.03 mi (7,837.56 km) |
| Circleville to Orte | 4,685.24 mi (7,540.17 km) |
| Circleville to Ortona | 4,774.15 mi (7,683.26 km) |
| Circleville to Orvieto | 4,663.65 mi (7,505.42 km) |
| Circleville to Orzinuovi | 4,472.48 mi (7,197.77 km) |
| Circleville to Osimo | 4,691.44 mi (7,550.15 km) |
| Circleville to Ospitaletto | 4,472.62 mi (7,197.98 km) |
| Circleville to Ostuni | 4,972.95 mi (8,003.19 km) |
| Circleville to Ottaviano | 4,837.41 mi (7,785.05 km) |
| Circleville to Ovada | 4,446.36 mi (7,155.73 km) |
| Circleville to Ozieri | 4,610.99 mi (7,420.67 km) |
| Circleville to Paceco | 4,868.94 mi (7,835.81 km) |
