| Elk River to Octeville | 4,023.25 mi (6,474.79 km) |
| Elk River to Oignies | 4,157.47 mi (6,690.80 km) |
| Elk River to Oissel | 4,135.02 mi (6,654.67 km) |
| Elk River to Olivet | 4,225.40 mi (6,800.12 km) |
| Elk River to Ollioules | 4,578.99 mi (7,369.18 km) |
| Elk River to Olonne-sur-Mer | 4,140.83 mi (6,664.02 km) |
| Elk River to Oloron-Sainte-Marie | 4,324.71 mi (6,959.95 km) |
| Elk River to Onet Village | 4,400.01 mi (7,081.13 km) |
| Elk River to Onnaing | 4,182.19 mi (6,730.58 km) |
| Elk River to Orange | 4,494.79 mi (7,233.67 km) |
| Elk River to Orchies | 4,166.11 mi (6,704.70 km) |
| Elk River to Orleans | 4,224.11 mi (6,798.04 km) |
| Elk River to Orly | 4,206.98 mi (6,770.47 km) |
| Elk River to Ormesson-sur-Marne | 4,210.54 mi (6,776.21 km) |
| Elk River to Orsay | 4,201.38 mi (6,761.46 km) |
