| Western Springs to Nuth | 4,207.53 mi (6,771.37 km) |
| Western Springs to Oegstgeest | 4,110.36 mi (6,614.98 km) |
| Western Springs to Oirschot | 4,165.01 mi (6,702.93 km) |
| Western Springs to Oisterwijk | 4,158.36 mi (6,692.23 km) |
| Western Springs to Oldebroek | 4,153.13 mi (6,683.82 km) |
| Western Springs to Oldenzaal | 4,195.16 mi (6,751.46 km) |
| Western Springs to Ommen | 4,169.38 mi (6,709.97 km) |
| Western Springs to Oosterend | 4,139.51 mi (6,661.90 km) |
| Western Springs to Oosterhout | 4,143.60 mi (6,668.48 km) |
| Western Springs to Oosterwolde | 4,148.01 mi (6,675.58 km) |
| Western Springs to Oostzaan | 4,116.86 mi (6,625.45 km) |
| Western Springs to Opmeer | 4,110.00 mi (6,614.41 km) |
| Western Springs to Oss | 4,163.48 mi (6,700.47 km) |
| Western Springs to Oud-Beijerland | 4,120.67 mi (6,631.57 km) |
| Western Springs to Oudenbosch | 4,133.20 mi (6,651.74 km) |
