| Ridge to Octeville | 3,384.12 mi (5,446.22 km) |
| Ridge to Oignies | 3,558.63 mi (5,727.05 km) |
| Ridge to Oissel | 3,506.44 mi (5,643.07 km) |
| Ridge to Olivet | 3,577.64 mi (5,757.65 km) |
| Ridge to Ollioules | 3,886.60 mi (6,254.88 km) |
| Ridge to Olonne-sur-Mer | 3,450.42 mi (5,552.91 km) |
| Ridge to Oloron-Sainte-Marie | 3,591.34 mi (5,779.70 km) |
| Ridge to Onet Village | 3,703.56 mi (5,960.31 km) |
| Ridge to Onnaing | 3,585.50 mi (5,770.30 km) |
| Ridge to Orange | 3,809.46 mi (6,130.73 km) |
| Ridge to Orchies | 3,568.81 mi (5,743.44 km) |
| Ridge to Orleans | 3,577.01 mi (5,756.64 km) |
| Ridge to Orly | 3,576.23 mi (5,755.39 km) |
| Ridge to Ormesson-sur-Marne | 3,581.34 mi (5,763.60 km) |
| Ridge to Orsay | 3,568.68 mi (5,743.23 km) |
