| Severn to Octeville | 3,619.02 mi (5,824.26 km) |
| Severn to Oignies | 3,792.44 mi (6,103.35 km) |
| Severn to Oissel | 3,741.17 mi (6,020.84 km) |
| Severn to Olivet | 3,812.92 mi (6,136.30 km) |
| Severn to Ollioules | 4,122.57 mi (6,634.63 km) |
| Severn to Olonne-sur-Mer | 3,686.30 mi (5,932.52 km) |
| Severn to Oloron-Sainte-Marie | 3,827.21 mi (6,159.29 km) |
| Severn to Onet Village | 3,939.53 mi (6,340.06 km) |
| Severn to Onnaing | 3,819.27 mi (6,146.53 km) |
| Severn to Orange | 4,045.38 mi (6,510.41 km) |
| Severn to Orchies | 3,802.58 mi (6,119.66 km) |
| Severn to Orleans | 3,812.27 mi (6,135.26 km) |
| Severn to Orly | 3,811.09 mi (6,133.36 km) |
| Severn to Ormesson-sur-Marne | 3,816.16 mi (6,141.52 km) |
| Severn to Orsay | 3,803.58 mi (6,121.28 km) |
