| Fern Down to Octeville | 82.53 mi (132.82 km) |
| Fern Down to Oignies | 215.68 mi (347.10 km) |
| Fern Down to Oissel | 166.96 mi (268.70 km) |
| Fern Down to Olivet | 265.85 mi (427.84 km) |
| Fern Down to Ollioules | 642.87 mi (1,034.59 km) |
| Fern Down to Olonne-sur-Mer | 295.35 mi (475.33 km) |
| Fern Down to Oloron-Sainte-Marie | 529.69 mi (852.46 km) |
| Fern Down to Onet Village | 491.82 mi (791.51 km) |
| Fern Down to Onnaing | 242.83 mi (390.79 km) |
| Fern Down to Orange | 556.88 mi (896.21 km) |
| Fern Down to Orchies | 226.54 mi (364.58 km) |
| Fern Down to Orleans | 264.01 mi (424.89 km) |
| Fern Down to Orly | 238.82 mi (384.34 km) |
| Fern Down to Ormesson-sur-Marne | 242.30 mi (389.94 km) |
| Fern Down to Orsay | 233.57 mi (375.90 km) |
