| Allentown to Opole | 4,260.31 mi (6,856.31 km) |
| Allentown to Orzesze | 4,309.51 mi (6,935.48 km) |
| Allentown to Osowa | 4,150.71 mi (6,679.92 km) |
| Allentown to Ostroda | 4,228.30 mi (6,804.78 km) |
| Allentown to Ostroleka | 4,307.35 mi (6,932.01 km) |
| Allentown to Ostrow Mazowiecka | 4,328.87 mi (6,966.64 km) |
| Allentown to Ostrow Wielkopolski | 4,221.70 mi (6,794.17 km) |
| Allentown to Ostrowiec Swietokrzyski | 4,379.71 mi (7,048.46 km) |
| Allentown to Ostrzeszow | 4,234.11 mi (6,814.14 km) |
| Allentown to Oswiecim | 4,331.37 mi (6,970.66 km) |
| Allentown to Otwock | 4,331.26 mi (6,970.48 km) |
| Allentown to Ozarow Mazowiecki | 4,310.80 mi (6,937.57 km) |
| Allentown to Ozimek | 4,270.63 mi (6,872.92 km) |
| Allentown to Ozorkow | 4,264.66 mi (6,863.31 km) |
| Allentown to Pabianice | 4,279.56 mi (6,887.28 km) |
