| Iona to Nuth | 4,727.47 mi (7,608.13 km) |
| Iona to Oegstgeest | 4,645.81 mi (7,476.72 km) |
| Iona to Oirschot | 4,692.30 mi (7,551.53 km) |
| Iona to Oisterwijk | 4,686.64 mi (7,542.43 km) |
| Iona to Oldebroek | 4,699.58 mi (7,563.25 km) |
| Iona to Oldenzaal | 4,744.02 mi (7,634.77 km) |
| Iona to Ommen | 4,719.30 mi (7,594.97 km) |
| Iona to Oosterend | 4,696.20 mi (7,557.80 km) |
| Iona to Oosterhout | 4,671.36 mi (7,517.82 km) |
| Iona to Oosterwolde | 4,705.46 mi (7,572.71 km) |
| Iona to Oostzaan | 4,658.52 mi (7,497.16 km) |
| Iona to Opmeer | 4,656.59 mi (7,494.05 km) |
| Iona to Oss | 4,696.40 mi (7,558.12 km) |
| Iona to Oud-Beijerland | 4,649.40 mi (7,482.48 km) |
| Iona to Oudenbosch | 4,658.50 mi (7,497.13 km) |
