| Great Falls to Octeville | 4,526.42 mi (7,284.57 km) |
| Great Falls to Oignies | 4,624.79 mi (7,442.88 km) |
| Great Falls to Oissel | 4,625.26 mi (7,443.64 km) |
| Great Falls to Olivet | 4,725.65 mi (7,605.20 km) |
| Great Falls to Ollioules | 5,098.09 mi (8,204.59 km) |
| Great Falls to Olonne-sur-Mer | 4,676.10 mi (7,525.46 km) |
| Great Falls to Oloron-Sainte-Marie | 4,884.41 mi (7,860.69 km) |
| Great Falls to Onet Village | 4,929.18 mi (7,932.76 km) |
| Great Falls to Onnaing | 4,646.72 mi (7,478.18 km) |
| Great Falls to Orange | 5,011.83 mi (8,065.75 km) |
| Great Falls to Orchies | 4,631.87 mi (7,454.28 km) |
| Great Falls to Orleans | 4,723.93 mi (7,602.43 km) |
| Great Falls to Orly | 4,695.49 mi (7,556.66 km) |
| Great Falls to Ormesson-sur-Marne | 4,697.75 mi (7,560.30 km) |
| Great Falls to Orsay | 4,691.59 mi (7,550.39 km) |
