| Rathfarnham to Octeville | 322.81 mi (519.52 km) |
| Rathfarnham to Oignies | 440.94 mi (709.63 km) |
| Rathfarnham to Oissel | 419.40 mi (674.96 km) |
| Rathfarnham to Olivet | 518.98 mi (835.22 km) |
| Rathfarnham to Ollioules | 894.50 mi (1,439.56 km) |
| Rathfarnham to Olonne-sur-Mer | 508.31 mi (818.04 km) |
| Rathfarnham to Oloron-Sainte-Marie | 744.86 mi (1,198.74 km) |
| Rathfarnham to Onet Village | 736.36 mi (1,185.06 km) |
| Rathfarnham to Onnaing | 466.85 mi (751.33 km) |
| Rathfarnham to Orange | 808.26 mi (1,300.77 km) |
| Rathfarnham to Orchies | 450.33 mi (724.74 km) |
| Rathfarnham to Orleans | 517.21 mi (832.37 km) |
| Rathfarnham to Orly | 490.63 mi (789.59 km) |
| Rathfarnham to Ormesson-sur-Marne | 493.52 mi (794.25 km) |
| Rathfarnham to Orsay | 486.04 mi (782.20 km) |
