| Cape Girardeau to Orbetello | 5,015.01 mi (8,070.87 km) |
| Cape Girardeau to Oria | 5,361.04 mi (8,627.76 km) |
| Cape Girardeau to Oristano | 5,002.45 mi (8,050.66 km) |
| Cape Girardeau to Orta Nova | 5,246.72 mi (8,443.78 km) |
| Cape Girardeau to Orte | 5,062.98 mi (8,148.07 km) |
| Cape Girardeau to Ortona | 5,150.36 mi (8,288.71 km) |
| Cape Girardeau to Orvieto | 5,041.20 mi (8,113.02 km) |
| Cape Girardeau to Orzinuovi | 4,847.22 mi (7,800.85 km) |
| Cape Girardeau to Osimo | 5,066.56 mi (8,153.84 km) |
| Cape Girardeau to Ospitaletto | 4,846.95 mi (7,800.42 km) |
| Cape Girardeau to Ostuni | 5,348.88 mi (8,608.18 km) |
| Cape Girardeau to Ottaviano | 5,215.90 mi (8,394.17 km) |
| Cape Girardeau to Ovada | 4,823.46 mi (7,762.62 km) |
| Cape Girardeau to Ozieri | 4,993.92 mi (8,036.93 km) |
| Cape Girardeau to Paceco | 5,252.71 mi (8,453.42 km) |
