| Ialysos to Oegstgeest | 1,585.93 mi (2,552.31 km) |
| Ialysos to Oirschot | 1,530.04 mi (2,462.35 km) |
| Ialysos to Oisterwijk | 1,536.82 mi (2,473.27 km) |
| Ialysos to Oldebroek | 1,547.30 mi (2,490.14 km) |
| Ialysos to Oldenzaal | 1,507.17 mi (2,425.56 km) |
| Ialysos to Ommen | 1,532.83 mi (2,466.85 km) |
| Ialysos to Oosterend | 1,565.10 mi (2,518.78 km) |
| Ialysos to Oosterhout | 1,551.35 mi (2,496.65 km) |
| Ialysos to Oosterwolde | 1,557.20 mi (2,506.07 km) |
| Ialysos to Oostzaan | 1,581.25 mi (2,544.78 km) |
| Ialysos to Opmeer | 1,589.67 mi (2,558.32 km) |
| Ialysos to Oss | 1,532.80 mi (2,466.80 km) |
| Ialysos to Oud-Beijerland | 1,574.28 mi (2,533.55 km) |
| Ialysos to Oudenbosch | 1,561.25 mi (2,512.60 km) |
| Ialysos to Oudewater | 1,565.42 mi (2,519.30 km) |
