| Fort Campbell North to Orbetello | 4,956.03 mi (7,975.96 km) |
| Fort Campbell North to Oria | 5,304.57 mi (8,536.88 km) |
| Fort Campbell North to Oristano | 4,937.21 mi (7,945.66 km) |
| Fort Campbell North to Orta Nova | 5,189.81 mi (8,352.20 km) |
| Fort Campbell North to Orte | 5,005.01 mi (8,054.78 km) |
| Fort Campbell North to Ortona | 5,093.93 mi (8,197.89 km) |
| Fort Campbell North to Orvieto | 4,983.42 mi (8,020.04 km) |
| Fort Campbell North to Orzinuovi | 4,792.21 mi (7,712.31 km) |
| Fort Campbell North to Osimo | 5,011.19 mi (8,064.73 km) |
| Fort Campbell North to Ospitaletto | 4,792.32 mi (7,712.49 km) |
| Fort Campbell North to Ostuni | 5,292.73 mi (8,517.82 km) |
| Fort Campbell North to Ottaviano | 5,157.14 mi (8,299.61 km) |
| Fort Campbell North to Ovada | 4,766.14 mi (7,670.36 km) |
| Fort Campbell North to Ozieri | 4,930.10 mi (7,934.24 km) |
| Fort Campbell North to Paceco | 5,187.80 mi (8,348.96 km) |
