| Monrovia to Nuth | 5,641.74 mi (9,079.50 km) |
| Monrovia to Oegstgeest | 5,536.68 mi (8,910.42 km) |
| Monrovia to Oirschot | 5,595.24 mi (9,004.67 km) |
| Monrovia to Oisterwijk | 5,588.13 mi (8,993.22 km) |
| Monrovia to Oldebroek | 5,566.09 mi (8,957.76 km) |
| Monrovia to Oldenzaal | 5,602.88 mi (9,016.96 km) |
| Monrovia to Ommen | 5,577.86 mi (8,976.70 km) |
| Monrovia to Oosterend | 5,543.47 mi (8,921.35 km) |
| Monrovia to Oosterhout | 5,574.84 mi (8,971.84 km) |
| Monrovia to Oosterwolde | 5,550.63 mi (8,932.87 km) |
| Monrovia to Oostzaan | 5,536.90 mi (8,910.78 km) |
| Monrovia to Opmeer | 5,525.81 mi (8,892.94 km) |
| Monrovia to Oss | 5,588.58 mi (8,993.94 km) |
| Monrovia to Oud-Beijerland | 5,552.54 mi (8,935.95 km) |
| Monrovia to Oudenbosch | 5,567.39 mi (8,959.86 km) |
