| Madison to Orbetello | 4,753.20 mi (7,649.53 km) |
| Madison to Oria | 5,090.88 mi (8,192.97 km) |
| Madison to Oristano | 4,758.95 mi (7,658.80 km) |
| Madison to Orta Nova | 4,978.22 mi (8,011.68 km) |
| Madison to Orte | 4,798.15 mi (7,721.88 km) |
| Madison to Ortona | 4,880.98 mi (7,855.17 km) |
| Madison to Orvieto | 4,775.94 mi (7,686.13 km) |
| Madison to Orzinuovi | 4,575.30 mi (7,363.24 km) |
| Madison to Osimo | 4,794.67 mi (7,716.27 km) |
| Madison to Ospitaletto | 4,574.03 mi (7,361.19 km) |
| Madison to Ostuni | 5,077.92 mi (8,172.12 km) |
| Madison to Ottaviano | 4,952.60 mi (7,970.45 km) |
| Madison to Ovada | 4,557.91 mi (7,335.25 km) |
| Madison to Ozieri | 4,746.17 mi (7,638.22 km) |
| Madison to Paceco | 5,007.05 mi (8,058.07 km) |
