| River Ridge to Nuth | 4,888.89 mi (7,867.91 km) |
| River Ridge to Oegstgeest | 4,798.23 mi (7,722.00 km) |
| River Ridge to Oirschot | 4,849.50 mi (7,804.51 km) |
| River Ridge to Oisterwijk | 4,843.26 mi (7,794.48 km) |
| River Ridge to Oldebroek | 4,846.60 mi (7,799.85 km) |
| River Ridge to Oldenzaal | 4,890.15 mi (7,869.93 km) |
| River Ridge to Ommen | 4,864.63 mi (7,828.86 km) |
| River Ridge to Oosterend | 4,837.65 mi (7,785.44 km) |
| River Ridge to Oosterhout | 4,828.11 mi (7,770.09 km) |
| River Ridge to Oosterwolde | 4,846.58 mi (7,799.82 km) |
| River Ridge to Oostzaan | 4,807.73 mi (7,737.30 km) |
| River Ridge to Opmeer | 4,803.13 mi (7,729.90 km) |
| River Ridge to Oss | 4,850.64 mi (7,806.35 km) |
| River Ridge to Oud-Beijerland | 4,805.42 mi (7,733.58 km) |
| River Ridge to Oudenbosch | 4,816.43 mi (7,751.29 km) |
