| Monroe to Orbetello | 5,341.47 mi (8,596.27 km) |
| Monroe to Oria | 5,690.83 mi (9,158.51 km) |
| Monroe to Oristano | 5,319.52 mi (8,560.93 km) |
| Monroe to Orta Nova | 5,575.95 mi (8,973.63 km) |
| Monroe to Orte | 5,390.82 mi (8,675.68 km) |
| Monroe to Ortona | 5,480.24 mi (8,819.59 km) |
| Monroe to Orvieto | 5,369.30 mi (8,641.06 km) |
| Monroe to Orzinuovi | 5,178.96 mi (8,334.74 km) |
| Monroe to Osimo | 5,397.82 mi (8,686.95 km) |
| Monroe to Ospitaletto | 5,179.17 mi (8,335.07 km) |
| Monroe to Ostuni | 5,679.09 mi (9,139.61 km) |
| Monroe to Ottaviano | 5,542.62 mi (8,919.99 km) |
| Monroe to Ovada | 5,152.22 mi (8,291.70 km) |
| Monroe to Ozieri | 5,313.26 mi (8,550.86 km) |
| Monroe to Paceco | 5,570.22 mi (8,964.40 km) |
