| Hwlffordd to Octeville | 209.07 mi (336.47 km) |
| Hwlffordd to Oignies | 357.10 mi (574.69 km) |
| Hwlffordd to Oissel | 315.43 mi (507.64 km) |
| Hwlffordd to Olivet | 409.22 mi (658.58 km) |
| Hwlffordd to Ollioules | 781.46 mi (1,257.63 km) |
| Hwlffordd to Olonne-sur-Mer | 391.23 mi (629.63 km) |
| Hwlffordd to Oloron-Sainte-Marie | 628.23 mi (1,011.04 km) |
| Hwlffordd to Onet Village | 620.35 mi (998.36 km) |
| Hwlffordd to Onnaing | 384.14 mi (618.21 km) |
| Hwlffordd to Orange | 695.13 mi (1,118.70 km) |
| Hwlffordd to Orchies | 367.47 mi (591.39 km) |
| Hwlffordd to Orleans | 407.65 mi (656.05 km) |
| Hwlffordd to Orly | 387.41 mi (623.48 km) |
| Hwlffordd to Ormesson-sur-Marne | 391.14 mi (629.47 km) |
| Hwlffordd to Orsay | 381.74 mi (614.36 km) |
