| Upper Grand Lagoon to Octeville | 4,412.79 mi (7,101.70 km) |
| Upper Grand Lagoon to Oignies | 4,590.32 mi (7,387.40 km) |
| Upper Grand Lagoon to Oissel | 4,535.71 mi (7,299.52 km) |
| Upper Grand Lagoon to Olivet | 4,604.23 mi (7,409.80 km) |
| Upper Grand Lagoon to Ollioules | 4,903.17 mi (7,890.88 km) |
| Upper Grand Lagoon to Olonne-sur-Mer | 4,470.80 mi (7,195.05 km) |
| Upper Grand Lagoon to Oloron-Sainte-Marie | 4,600.32 mi (7,403.50 km) |
| Upper Grand Lagoon to Onet Village | 4,720.69 mi (7,597.21 km) |
| Upper Grand Lagoon to Onnaing | 4,617.27 mi (7,430.77 km) |
| Upper Grand Lagoon to Orange | 4,828.13 mi (7,770.12 km) |
| Upper Grand Lagoon to Orchies | 4,600.58 mi (7,403.92 km) |
| Upper Grand Lagoon to Orleans | 4,603.70 mi (7,408.94 km) |
| Upper Grand Lagoon to Orly | 4,604.96 mi (7,410.97 km) |
| Upper Grand Lagoon to Ormesson-sur-Marne | 4,610.21 mi (7,419.42 km) |
| Upper Grand Lagoon to Orsay | 4,597.21 mi (7,398.50 km) |
