| Allentown to Nuth | 3,783.40 mi (6,088.79 km) |
| Allentown to Oegstgeest | 3,693.84 mi (5,944.66 km) |
| Allentown to Oirschot | 3,744.49 mi (6,026.17 km) |
| Allentown to Oisterwijk | 3,738.32 mi (6,016.25 km) |
| Allentown to Oldebroek | 3,743.18 mi (6,024.06 km) |
| Allentown to Oldenzaal | 3,786.95 mi (6,094.51 km) |
| Allentown to Ommen | 3,761.53 mi (6,053.61 km) |
| Allentown to Oosterend | 3,735.26 mi (6,011.32 km) |
| Allentown to Oosterhout | 3,723.13 mi (5,991.80 km) |
| Allentown to Oosterwolde | 3,744.28 mi (6,025.84 km) |
| Allentown to Oostzaan | 3,703.87 mi (5,960.81 km) |
| Allentown to Opmeer | 3,699.72 mi (5,954.13 km) |
| Allentown to Oss | 3,746.05 mi (6,028.68 km) |
| Allentown to Oud-Beijerland | 3,700.52 mi (5,955.41 km) |
| Allentown to Oudenbosch | 3,711.28 mi (5,972.73 km) |
