| Clarksburg to Nuth | 3,917.15 mi (6,304.04 km) |
| Clarksburg to Oegstgeest | 3,827.74 mi (6,160.15 km) |
| Clarksburg to Oirschot | 3,878.32 mi (6,241.55 km) |
| Clarksburg to Oisterwijk | 3,872.16 mi (6,231.64 km) |
| Clarksburg to Oldebroek | 3,877.15 mi (6,239.68 km) |
| Clarksburg to Oldenzaal | 3,920.94 mi (6,310.15 km) |
| Clarksburg to Ommen | 3,895.53 mi (6,269.26 km) |
| Clarksburg to Oosterend | 3,869.30 mi (6,227.03 km) |
| Clarksburg to Oosterhout | 3,856.97 mi (6,207.19 km) |
| Clarksburg to Oosterwolde | 3,878.32 mi (6,241.55 km) |
| Clarksburg to Oostzaan | 3,837.82 mi (6,176.37 km) |
| Clarksburg to Opmeer | 3,833.71 mi (6,169.75 km) |
| Clarksburg to Oss | 3,879.92 mi (6,244.14 km) |
| Clarksburg to Oud-Beijerland | 3,834.36 mi (6,170.81 km) |
| Clarksburg to Oudenbosch | 3,845.09 mi (6,188.08 km) |
