| Wallingford Center to Orbetello | 4,126.29 mi (6,640.61 km) |
| Wallingford Center to Oria | 4,478.85 mi (7,208.01 km) |
| Wallingford Center to Oristano | 4,097.24 mi (6,593.86 km) |
| Wallingford Center to Orta Nova | 4,363.49 mi (7,022.36 km) |
| Wallingford Center to Orte | 4,177.06 mi (6,722.33 km) |
| Wallingford Center to Ortona | 4,268.78 mi (6,869.94 km) |
| Wallingford Center to Orvieto | 4,155.89 mi (6,688.26 km) |
| Wallingford Center to Orzinuovi | 3,970.83 mi (6,390.43 km) |
| Wallingford Center to Osimo | 4,188.43 mi (6,740.62 km) |
| Wallingford Center to Ospitaletto | 3,971.75 mi (6,391.92 km) |
| Wallingford Center to Ostuni | 4,467.65 mi (7,189.99 km) |
| Wallingford Center to Ottaviano | 4,327.37 mi (6,964.23 km) |
| Wallingford Center to Ovada | 3,940.04 mi (6,340.89 km) |
| Wallingford Center to Ozieri | 4,092.24 mi (6,585.82 km) |
| Wallingford Center to Paceco | 4,347.98 mi (6,997.39 km) |
