| Trumbull Center to Orbetello | 4,149.96 mi (6,678.71 km) |
| Trumbull Center to Oria | 4,502.55 mi (7,246.16 km) |
| Trumbull Center to Oristano | 4,120.71 mi (6,631.65 km) |
| Trumbull Center to Orta Nova | 4,387.19 mi (7,060.50 km) |
| Trumbull Center to Orte | 4,200.75 mi (6,760.45 km) |
| Trumbull Center to Ortona | 4,292.49 mi (6,908.10 km) |
| Trumbull Center to Orvieto | 4,179.59 mi (6,726.40 km) |
| Trumbull Center to Orzinuovi | 3,994.57 mi (6,428.64 km) |
| Trumbull Center to Osimo | 4,212.16 mi (6,778.82 km) |
| Trumbull Center to Ospitaletto | 3,995.50 mi (6,430.14 km) |
| Trumbull Center to Ostuni | 4,491.36 mi (7,228.15 km) |
| Trumbull Center to Ottaviano | 4,351.04 mi (7,002.32 km) |
| Trumbull Center to Ovada | 3,963.76 mi (6,379.05 km) |
| Trumbull Center to Ozieri | 4,115.77 mi (6,623.69 km) |
| Trumbull Center to Paceco | 4,371.45 mi (7,035.17 km) |
