| Monrovia to Oerlinghausen | 5,670.51 mi (9,125.80 km) |
| Monrovia to Oestrich-Winkel | 5,751.63 mi (9,256.35 km) |
| Monrovia to Offenburg | 5,827.89 mi (9,379.09 km) |
| Monrovia to Oftersheim | 5,801.41 mi (9,336.46 km) |
| Monrovia to Ohrdruf | 5,788.38 mi (9,315.50 km) |
| Monrovia to Ohringen | 5,837.61 mi (9,394.72 km) |
| Monrovia to Olbernhau | 5,869.36 mi (9,445.82 km) |
| Monrovia to Olching | 5,943.98 mi (9,565.90 km) |
| Monrovia to Oldenburg | 5,597.55 mi (9,008.38 km) |
| Monrovia to Oldenburg in Holstein | 5,610.29 mi (9,028.89 km) |
| Monrovia to Olfen | 5,646.20 mi (9,086.68 km) |
| Monrovia to Olpe | 5,694.88 mi (9,165.03 km) |
| Monrovia to Olsberg | 5,696.84 mi (9,168.18 km) |
| Monrovia to Oranienburg | 5,754.19 mi (9,260.48 km) |
| Monrovia to Ortenberg | 5,764.63 mi (9,277.27 km) |
