| Pottstown to Orbetello | 4,295.30 mi (6,912.62 km) |
| Pottstown to Oria | 4,647.66 mi (7,479.68 km) |
| Pottstown to Oristano | 4,266.55 mi (6,866.35 km) |
| Pottstown to Orta Nova | 4,532.32 mi (7,294.07 km) |
| Pottstown to Orte | 4,345.98 mi (6,994.18 km) |
| Pottstown to Ortona | 4,437.53 mi (7,141.51 km) |
| Pottstown to Orvieto | 4,324.79 mi (6,960.07 km) |
| Pottstown to Orzinuovi | 4,139.26 mi (6,661.50 km) |
| Pottstown to Osimo | 4,357.00 mi (7,011.91 km) |
| Pottstown to Ospitaletto | 4,140.12 mi (6,662.88 km) |
| Pottstown to Ostuni | 4,636.42 mi (7,461.59 km) |
| Pottstown to Ottaviano | 4,496.41 mi (7,236.27 km) |
| Pottstown to Ovada | 4,108.82 mi (6,612.51 km) |
| Pottstown to Ozieri | 4,261.54 mi (6,858.29 km) |
| Pottstown to Paceco | 4,517.29 mi (7,269.88 km) |
