| Blackrock to Octeville | 320.12 mi (515.18 km) |
| Blackrock to Oignies | 436.92 mi (703.15 km) |
| Blackrock to Oissel | 416.01 mi (669.51 km) |
| Blackrock to Olivet | 515.87 mi (830.22 km) |
| Blackrock to Ollioules | 891.60 mi (1,434.90 km) |
| Blackrock to Olonne-sur-Mer | 506.62 mi (815.32 km) |
| Blackrock to Oloron-Sainte-Marie | 743.34 mi (1,196.28 km) |
| Blackrock to Onet Village | 733.88 mi (1,181.06 km) |
| Blackrock to Onnaing | 462.79 mi (744.79 km) |
| Blackrock to Orange | 805.38 mi (1,296.13 km) |
| Blackrock to Orchies | 446.28 mi (718.22 km) |
| Blackrock to Orleans | 514.09 mi (827.35 km) |
| Blackrock to Orly | 487.18 mi (784.03 km) |
| Blackrock to Ormesson-sur-Marne | 490.03 mi (788.63 km) |
| Blackrock to Orsay | 482.63 mi (776.72 km) |
