| Cahokia to Orbetello | 4,984.34 mi (8,021.53 km) |
| Cahokia to Oria | 5,328.16 mi (8,574.84 km) |
| Cahokia to Oristano | 4,976.99 mi (8,009.70 km) |
| Cahokia to Orta Nova | 5,214.26 mi (8,391.54 km) |
| Cahokia to Orte | 5,031.47 mi (8,097.37 km) |
| Cahokia to Ortona | 5,117.58 mi (8,235.95 km) |
| Cahokia to Orvieto | 5,009.55 mi (8,062.09 km) |
| Cahokia to Orzinuovi | 4,813.50 mi (7,746.58 km) |
| Cahokia to Osimo | 5,032.99 mi (8,099.81 km) |
| Cahokia to Ospitaletto | 4,812.94 mi (7,745.68 km) |
| Cahokia to Ostuni | 5,315.76 mi (8,554.88 km) |
| Cahokia to Ottaviano | 5,184.94 mi (8,344.35 km) |
| Cahokia to Ovada | 4,791.59 mi (7,711.32 km) |
| Cahokia to Ozieri | 4,967.26 mi (7,994.03 km) |
| Cahokia to Paceco | 5,226.82 mi (8,411.76 km) |
