| Troy to Orbetello | 4,522.92 mi (7,278.94 km) |
| Troy to Oria | 4,867.20 mi (7,833.00 km) |
| Troy to Oristano | 4,515.75 mi (7,267.39 km) |
| Troy to Orta Nova | 4,753.19 mi (7,649.52 km) |
| Troy to Orte | 4,570.18 mi (7,355.00 km) |
| Troy to Ortona | 4,656.59 mi (7,494.05 km) |
| Troy to Orvieto | 4,548.29 mi (7,319.77 km) |
| Troy to Orzinuovi | 4,352.76 mi (7,005.10 km) |
| Troy to Osimo | 4,572.22 mi (7,358.27 km) |
| Troy to Ospitaletto | 4,352.30 mi (7,004.35 km) |
| Troy to Ostuni | 4,854.86 mi (7,813.15 km) |
| Troy to Ottaviano | 4,723.57 mi (7,601.84 km) |
| Troy to Ovada | 4,330.36 mi (6,969.05 km) |
| Troy to Ozieri | 4,505.82 mi (7,251.42 km) |
| Troy to Paceco | 4,765.48 mi (7,669.30 km) |
