| Upper Montclair to Nuth | 3,721.27 mi (5,988.80 km) |
| Upper Montclair to Oegstgeest | 3,632.27 mi (5,845.57 km) |
| Upper Montclair to Oirschot | 3,682.62 mi (5,926.61 km) |
| Upper Montclair to Oisterwijk | 3,676.49 mi (5,916.74 km) |
| Upper Montclair to Oldebroek | 3,681.99 mi (5,925.59 km) |
| Upper Montclair to Oldenzaal | 3,725.85 mi (5,996.17 km) |
| Upper Montclair to Ommen | 3,700.47 mi (5,955.34 km) |
| Upper Montclair to Oosterend | 3,674.46 mi (5,913.47 km) |
| Upper Montclair to Oosterhout | 3,661.28 mi (5,892.27 km) |
| Upper Montclair to Oosterwolde | 3,683.51 mi (5,928.03 km) |
| Upper Montclair to Oostzaan | 3,642.52 mi (5,862.07 km) |
| Upper Montclair to Opmeer | 3,638.55 mi (5,855.69 km) |
| Upper Montclair to Oss | 3,684.37 mi (5,929.43 km) |
| Upper Montclair to Oud-Beijerland | 3,638.71 mi (5,855.93 km) |
| Upper Montclair to Oudenbosch | 3,649.35 mi (5,873.06 km) |
