| Madison to Octeville | 3,965.12 mi (6,381.24 km) |
| Madison to Oignies | 4,111.39 mi (6,616.65 km) |
| Madison to Oissel | 4,080.63 mi (6,567.15 km) |
| Madison to Olivet | 4,166.35 mi (6,705.09 km) |
| Madison to Ollioules | 4,509.56 mi (7,257.44 km) |
| Madison to Olonne-sur-Mer | 4,069.18 mi (6,548.71 km) |
| Madison to Oloron-Sainte-Marie | 4,241.81 mi (6,826.54 km) |
| Madison to Onet Village | 4,328.32 mi (6,965.76 km) |
| Madison to Onnaing | 4,136.89 mi (6,657.68 km) |
| Madison to Orange | 4,426.88 mi (7,124.38 km) |
| Madison to Orchies | 4,120.52 mi (6,631.33 km) |
| Madison to Orleans | 4,165.23 mi (6,703.29 km) |
| Madison to Orly | 4,152.52 mi (6,682.84 km) |
| Madison to Ormesson-sur-Marne | 4,156.54 mi (6,689.30 km) |
| Madison to Orsay | 4,146.34 mi (6,672.89 km) |
