| Westlake to Nuth | 3,998.17 mi (6,434.44 km) |
| Westlake to Oegstgeest | 3,904.19 mi (6,283.19 km) |
| Westlake to Oirschot | 3,957.18 mi (6,368.46 km) |
| Westlake to Oisterwijk | 3,950.73 mi (6,358.08 km) |
| Westlake to Oldebroek | 3,950.07 mi (6,357.02 km) |
| Westlake to Oldenzaal | 3,993.01 mi (6,426.14 km) |
| Westlake to Ommen | 3,967.33 mi (6,384.79 km) |
| Westlake to Oosterend | 3,939.01 mi (6,339.22 km) |
| Westlake to Oosterhout | 3,935.73 mi (6,333.95 km) |
| Westlake to Oosterwolde | 3,947.77 mi (6,353.32 km) |
| Westlake to Oostzaan | 3,912.32 mi (6,296.27 km) |
| Westlake to Opmeer | 3,906.67 mi (6,287.17 km) |
| Westlake to Oss | 3,957.04 mi (6,368.25 km) |
| Westlake to Oud-Beijerland | 3,912.88 mi (6,297.17 km) |
| Westlake to Oudenbosch | 3,924.64 mi (6,316.10 km) |
