| Fort Madison to Octeville | 4,152.43 mi (6,682.70 km) |
| Fort Madison to Oignies | 4,301.37 mi (6,922.39 km) |
| Fort Madison to Oissel | 4,268.76 mi (6,869.91 km) |
| Fort Madison to Olivet | 4,353.26 mi (7,005.90 km) |
| Fort Madison to Ollioules | 4,693.36 mi (7,553.23 km) |
| Fort Madison to Olonne-sur-Mer | 4,252.74 mi (6,844.13 km) |
| Fort Madison to Oloron-Sainte-Marie | 4,421.68 mi (7,116.00 km) |
| Fort Madison to Onet Village | 4,511.61 mi (7,260.74 km) |
| Fort Madison to Onnaing | 4,327.01 mi (6,963.65 km) |
| Fort Madison to Orange | 4,611.19 mi (7,420.99 km) |
| Fort Madison to Orchies | 4,310.59 mi (6,937.23 km) |
| Fort Madison to Orleans | 4,352.19 mi (7,004.17 km) |
| Fort Madison to Orly | 4,340.58 mi (6,985.48 km) |
| Fort Madison to Ormesson-sur-Marne | 4,344.70 mi (6,992.11 km) |
| Fort Madison to Orsay | 4,334.26 mi (6,975.32 km) |
