| Greystones to Octeville | 308.94 mi (497.20 km) |
| Greystones to Oignies | 428.72 mi (689.96 km) |
| Greystones to Oissel | 405.88 mi (653.20 km) |
| Greystones to Olivet | 505.23 mi (813.08 km) |
| Greystones to Ollioules | 880.66 mi (1,417.28 km) |
| Greystones to Olonne-sur-Mer | 494.90 mi (796.46 km) |
| Greystones to Oloron-Sainte-Marie | 731.61 mi (1,177.41 km) |
| Greystones to Onet Village | 722.52 mi (1,162.78 km) |
| Greystones to Onnaing | 454.75 mi (731.86 km) |
| Greystones to Orange | 794.41 mi (1,278.48 km) |
| Greystones to Orchies | 438.20 mi (705.21 km) |
| Greystones to Orleans | 503.47 mi (810.25 km) |
| Greystones to Orly | 477.19 mi (767.96 km) |
| Greystones to Ormesson-sur-Marne | 480.12 mi (772.69 km) |
| Greystones to Orsay | 472.53 mi (760.46 km) |
