| Phoenixville to Orbetello | 4,294.22 mi (6,910.88 km) |
| Phoenixville to Oria | 4,646.76 mi (7,478.23 km) |
| Phoenixville to Oristano | 4,264.82 mi (6,863.57 km) |
| Phoenixville to Orta Nova | 4,531.41 mi (7,292.59 km) |
| Phoenixville to Orte | 4,344.99 mi (6,992.59 km) |
| Phoenixville to Ortona | 4,436.68 mi (7,140.14 km) |
| Phoenixville to Orvieto | 4,323.82 mi (6,958.52 km) |
| Phoenixville to Orzinuovi | 4,138.62 mi (6,660.46 km) |
| Phoenixville to Osimo | 4,356.27 mi (7,010.74 km) |
| Phoenixville to Ospitaletto | 4,139.51 mi (6,661.90 km) |
| Phoenixville to Ostuni | 4,635.55 mi (7,460.20 km) |
| Phoenixville to Ottaviano | 4,495.31 mi (7,234.50 km) |
| Phoenixville to Ovada | 4,107.95 mi (6,611.10 km) |
| Phoenixville to Ozieri | 4,259.97 mi (6,855.76 km) |
| Phoenixville to Paceco | 4,515.56 mi (7,267.09 km) |
