| Monrovia to Orbetello | 6,246.17 mi (10,052.25 km) |
| Monrovia to Oria | 6,555.34 mi (10,549.80 km) |
| Monrovia to Oristano | 6,289.74 mi (10,122.36 km) |
| Monrovia to Orta Nova | 6,449.79 mi (10,379.93 km) |
| Monrovia to Orte | 6,283.10 mi (10,111.68 km) |
| Monrovia to Ortona | 6,352.88 mi (10,223.97 km) |
| Monrovia to Orvieto | 6,260.42 mi (10,075.17 km) |
| Monrovia to Orzinuovi | 6,049.03 mi (9,734.98 km) |
| Monrovia to Osimo | 6,262.62 mi (10,078.71 km) |
| Monrovia to Ospitaletto | 6,045.33 mi (9,729.02 km) |
| Monrovia to Ostuni | 6,540.69 mi (10,526.23 km) |
| Monrovia to Ottaviano | 6,437.34 mi (10,359.90 km) |
| Monrovia to Ovada | 6,047.16 mi (9,731.96 km) |
| Monrovia to Ozieri | 6,268.99 mi (10,088.97 km) |
| Monrovia to Paceco | 6,528.69 mi (10,506.90 km) |
