| Euclid to Nuth | 3,975.99 mi (6,398.74 km) |
| Euclid to Oegstgeest | 3,882.12 mi (6,247.66 km) |
| Euclid to Oirschot | 3,935.05 mi (6,332.84 km) |
| Euclid to Oisterwijk | 3,928.61 mi (6,322.48 km) |
| Euclid to Oldebroek | 3,928.10 mi (6,321.66 km) |
| Euclid to Oldenzaal | 3,971.07 mi (6,390.82 km) |
| Euclid to Ommen | 3,945.38 mi (6,349.48 km) |
| Euclid to Oosterend | 3,917.12 mi (6,304.00 km) |
| Euclid to Oosterhout | 3,913.60 mi (6,298.34 km) |
| Euclid to Oosterwolde | 3,925.89 mi (6,318.11 km) |
| Euclid to Oostzaan | 3,890.30 mi (6,260.83 km) |
| Euclid to Opmeer | 3,884.69 mi (6,251.80 km) |
| Euclid to Oss | 3,934.96 mi (6,332.71 km) |
| Euclid to Oud-Beijerland | 3,890.75 mi (6,261.56 km) |
| Euclid to Oudenbosch | 3,902.49 mi (6,280.46 km) |
