| Humacao to Orbetello | 4,728.27 mi (7,609.41 km) |
| Humacao to Oria | 5,075.51 mi (8,168.24 km) |
| Humacao to Oristano | 4,607.70 mi (7,415.38 km) |
| Humacao to Orta Nova | 4,967.22 mi (7,993.97 km) |
| Humacao to Orte | 4,787.66 mi (7,705.00 km) |
| Humacao to Ortona | 4,890.59 mi (7,870.65 km) |
| Humacao to Orvieto | 4,771.87 mi (7,679.58 km) |
| Humacao to Orzinuovi | 4,649.50 mi (7,482.65 km) |
| Humacao to Osimo | 4,835.14 mi (7,781.41 km) |
| Humacao to Ospitaletto | 4,655.66 mi (7,492.56 km) |
| Humacao to Ostuni | 5,070.14 mi (8,159.60 km) |
| Humacao to Ottaviano | 4,908.40 mi (7,899.31 km) |
| Humacao to Ovada | 4,589.45 mi (7,386.00 km) |
| Humacao to Ozieri | 4,625.52 mi (7,444.05 km) |
| Humacao to Paceco | 4,833.62 mi (7,778.97 km) |
