| Niles to Nuth | 4,193.37 mi (6,748.57 km) |
| Niles to Oegstgeest | 4,096.10 mi (6,592.03 km) |
| Niles to Oirschot | 4,150.80 mi (6,680.06 km) |
| Niles to Oisterwijk | 4,144.14 mi (6,669.35 km) |
| Niles to Oldebroek | 4,138.76 mi (6,660.70 km) |
| Niles to Oldenzaal | 4,180.76 mi (6,728.28 km) |
| Niles to Ommen | 4,154.98 mi (6,686.79 km) |
| Niles to Oosterend | 4,125.06 mi (6,638.64 km) |
| Niles to Oosterhout | 4,129.39 mi (6,645.62 km) |
| Niles to Oosterwolde | 4,133.56 mi (6,652.32 km) |
| Niles to Oostzaan | 4,102.55 mi (6,602.41 km) |
| Niles to Opmeer | 4,095.64 mi (6,591.30 km) |
| Niles to Oss | 4,149.22 mi (6,677.52 km) |
| Niles to Oud-Beijerland | 4,106.46 mi (6,608.70 km) |
| Niles to Oudenbosch | 4,119.01 mi (6,628.91 km) |
