| Cascades to Octeville | 3,652.07 mi (5,877.44 km) |
| Cascades to Oignies | 3,824.76 mi (6,155.36 km) |
| Cascades to Oissel | 3,774.09 mi (6,073.81 km) |
| Cascades to Olivet | 3,846.28 mi (6,189.99 km) |
| Cascades to Ollioules | 4,156.98 mi (6,690.02 km) |
| Cascades to Olonne-sur-Mer | 3,720.43 mi (5,987.45 km) |
| Cascades to Oloron-Sainte-Marie | 3,862.21 mi (6,215.63 km) |
| Cascades to Onet Village | 3,973.92 mi (6,395.40 km) |
| Cascades to Onnaing | 3,851.57 mi (6,198.50 km) |
| Cascades to Orange | 4,079.62 mi (6,565.52 km) |
| Cascades to Orchies | 3,834.88 mi (6,171.64 km) |
| Cascades to Orleans | 3,845.62 mi (6,188.93 km) |
| Cascades to Orly | 3,844.11 mi (6,186.49 km) |
| Cascades to Ormesson-sur-Marne | 3,849.14 mi (6,194.60 km) |
| Cascades to Orsay | 3,836.63 mi (6,174.46 km) |
