| Mandan to Orbetello | 5,003.10 mi (8,051.71 km) |
| Mandan to Oria | 5,318.98 mi (8,560.07 km) |
| Mandan to Oristano | 5,041.76 mi (8,113.93 km) |
| Mandan to Orta Nova | 5,211.48 mi (8,387.07 km) |
| Mandan to Orte | 5,041.58 mi (8,113.63 km) |
| Mandan to Ortona | 5,114.19 mi (8,230.50 km) |
| Mandan to Orvieto | 5,018.92 mi (8,077.17 km) |
| Mandan to Orzinuovi | 4,809.03 mi (7,739.39 km) |
| Mandan to Osimo | 5,024.50 mi (8,086.15 km) |
| Mandan to Ospitaletto | 4,805.81 mi (7,734.20 km) |
| Mandan to Ostuni | 5,304.68 mi (8,537.06 km) |
| Mandan to Ottaviano | 5,196.27 mi (8,362.59 km) |
| Mandan to Ovada | 4,804.24 mi (7,731.68 km) |
| Mandan to Ozieri | 5,021.75 mi (8,081.72 km) |
| Mandan to Paceco | 5,281.93 mi (8,500.44 km) |
