| Mercerville to Orbetello | 4,253.90 mi (6,845.99 km) |
| Mercerville to Oria | 4,606.76 mi (7,413.87 km) |
| Mercerville to Oristano | 4,223.43 mi (6,796.95 km) |
| Mercerville to Orta Nova | 4,491.37 mi (7,228.17 km) |
| Mercerville to Orte | 4,304.83 mi (6,927.96 km) |
| Mercerville to Ortona | 4,396.77 mi (7,075.92 km) |
| Mercerville to Orvieto | 4,283.71 mi (6,893.96 km) |
| Mercerville to Orzinuovi | 4,099.11 mi (6,596.88 km) |
| Mercerville to Osimo | 4,316.60 mi (6,946.89 km) |
| Mercerville to Ospitaletto | 4,100.08 mi (6,598.44 km) |
| Mercerville to Ostuni | 4,595.62 mi (7,395.94 km) |
| Mercerville to Ottaviano | 4,454.95 mi (7,169.55 km) |
| Mercerville to Ovada | 4,068.01 mi (6,546.83 km) |
| Mercerville to Ozieri | 4,218.81 mi (6,789.52 km) |
| Mercerville to Paceco | 4,474.15 mi (7,200.46 km) |
