| Dardenne Prairie to Orbetello | 4,998.35 mi (8,044.07 km) |
| Dardenne Prairie to Oria | 5,341.38 mi (8,596.11 km) |
| Dardenne Prairie to Oristano | 4,992.71 mi (8,034.99 km) |
| Dardenne Prairie to Orta Nova | 5,227.63 mi (8,413.07 km) |
| Dardenne Prairie to Orte | 5,045.19 mi (8,119.45 km) |
| Dardenne Prairie to Ortona | 5,130.86 mi (8,257.32 km) |
| Dardenne Prairie to Orvieto | 5,023.23 mi (8,084.10 km) |
| Dardenne Prairie to Orzinuovi | 4,826.49 mi (7,767.49 km) |
| Dardenne Prairie to Osimo | 5,046.00 mi (8,120.76 km) |
| Dardenne Prairie to Ospitaletto | 4,825.83 mi (7,766.42 km) |
| Dardenne Prairie to Ostuni | 5,328.89 mi (8,576.02 km) |
| Dardenne Prairie to Ottaviano | 5,198.82 mi (8,366.70 km) |
| Dardenne Prairie to Ovada | 4,805.21 mi (7,733.24 km) |
| Dardenne Prairie to Ozieri | 4,982.59 mi (8,018.70 km) |
| Dardenne Prairie to Paceco | 5,242.37 mi (8,436.78 km) |
