| Sidmouth to Octeville | 101.41 mi (163.21 km) |
| Sidmouth to Oignies | 273.79 mi (440.62 km) |
| Sidmouth to Oissel | 213.31 mi (343.28 km) |
| Sidmouth to Olivet | 302.44 mi (486.73 km) |
| Sidmouth to Ollioules | 673.79 mi (1,084.36 km) |
| Sidmouth to Olonne-sur-Mer | 294.03 mi (473.20 km) |
| Sidmouth to Oloron-Sainte-Marie | 531.83 mi (855.89 km) |
| Sidmouth to Onet Village | 513.83 mi (826.93 km) |
| Sidmouth to Onnaing | 300.84 mi (484.15 km) |
| Sidmouth to Orange | 587.46 mi (945.42 km) |
| Sidmouth to Orchies | 284.72 mi (458.22 km) |
| Sidmouth to Orleans | 300.95 mi (484.34 km) |
| Sidmouth to Orly | 284.86 mi (458.44 km) |
| Sidmouth to Ormesson-sur-Marne | 289.19 mi (465.41 km) |
| Sidmouth to Orsay | 278.44 mi (448.11 km) |
