| Elkridge to Orbetello | 4,384.53 mi (7,056.22 km) |
| Elkridge to Oria | 4,737.36 mi (7,624.04 km) |
| Elkridge to Oristano | 4,353.86 mi (7,006.85 km) |
| Elkridge to Orta Nova | 4,621.97 mi (7,438.35 km) |
| Elkridge to Orte | 4,435.45 mi (7,138.17 km) |
| Elkridge to Ortona | 4,527.35 mi (7,286.06 km) |
| Elkridge to Orvieto | 4,414.32 mi (7,104.16 km) |
| Elkridge to Orzinuovi | 4,229.58 mi (6,806.86 km) |
| Elkridge to Osimo | 4,447.12 mi (7,156.95 km) |
| Elkridge to Ospitaletto | 4,230.53 mi (6,808.38 km) |
| Elkridge to Ostuni | 4,726.20 mi (7,606.09 km) |
| Elkridge to Ottaviano | 4,585.58 mi (7,379.78 km) |
| Elkridge to Ovada | 4,198.59 mi (6,756.98 km) |
| Elkridge to Ozieri | 4,349.33 mi (6,999.57 km) |
| Elkridge to Paceco | 4,604.57 mi (7,410.35 km) |
