| Mentor to Octeville | 3,704.27 mi (5,961.44 km) |
| Mentor to Oignies | 3,865.68 mi (6,221.21 km) |
| Mentor to Oissel | 3,823.83 mi (6,153.86 km) |
| Mentor to Olivet | 3,902.52 mi (6,280.50 km) |
| Mentor to Ollioules | 4,229.42 mi (6,806.59 km) |
| Mentor to Olonne-sur-Mer | 3,789.46 mi (6,098.54 km) |
| Mentor to Oloron-Sainte-Marie | 3,946.33 mi (6,351.01 km) |
| Mentor to Onet Village | 4,046.56 mi (6,512.30 km) |
| Mentor to Onnaing | 3,892.01 mi (6,263.58 km) |
| Mentor to Orange | 4,149.31 mi (6,677.67 km) |
| Mentor to Orchies | 3,875.39 mi (6,236.84 km) |
| Mentor to Orleans | 3,901.65 mi (6,279.09 km) |
| Mentor to Orly | 3,895.00 mi (6,268.39 km) |
| Mentor to Ormesson-sur-Marne | 3,899.59 mi (6,275.78 km) |
| Mentor to Orsay | 3,888.08 mi (6,257.26 km) |
