| Reisterstown to Orbetello | 4,377.47 mi (7,044.86 km) |
| Reisterstown to Oria | 4,730.01 mi (7,612.21 km) |
| Reisterstown to Oristano | 4,347.87 mi (6,997.23 km) |
| Reisterstown to Orta Nova | 4,614.66 mi (7,426.57 km) |
| Reisterstown to Orte | 4,428.25 mi (7,126.57 km) |
| Reisterstown to Ortona | 4,519.92 mi (7,274.11 km) |
| Reisterstown to Orvieto | 4,407.07 mi (7,092.50 km) |
| Reisterstown to Orzinuovi | 4,221.82 mi (6,794.36 km) |
| Reisterstown to Osimo | 4,439.49 mi (7,144.67 km) |
| Reisterstown to Ospitaletto | 4,222.71 mi (6,795.79 km) |
| Reisterstown to Ostuni | 4,718.80 mi (7,594.17 km) |
| Reisterstown to Ottaviano | 4,578.56 mi (7,368.48 km) |
| Reisterstown to Ovada | 4,191.20 mi (6,745.08 km) |
| Reisterstown to Ozieri | 4,343.10 mi (6,989.54 km) |
| Reisterstown to Paceco | 4,598.61 mi (7,400.74 km) |
