| Merrifield to Orbetello | 4,419.20 mi (7,112.02 km) |
| Merrifield to Oria | 4,772.08 mi (7,679.92 km) |
| Merrifield to Oristano | 4,388.28 mi (7,062.25 km) |
| Merrifield to Orta Nova | 4,656.69 mi (7,494.22 km) |
| Merrifield to Orte | 4,470.15 mi (7,194.01 km) |
| Merrifield to Ortona | 4,562.08 mi (7,341.96 km) |
| Merrifield to Orvieto | 4,449.03 mi (7,160.01 km) |
| Merrifield to Orzinuovi | 4,264.36 mi (6,862.82 km) |
| Merrifield to Osimo | 4,481.88 mi (7,212.88 km) |
| Merrifield to Ospitaletto | 4,265.31 mi (6,864.35 km) |
| Merrifield to Ostuni | 4,760.93 mi (7,661.98 km) |
| Merrifield to Ottaviano | 4,620.25 mi (7,435.58 km) |
| Merrifield to Ovada | 4,233.32 mi (6,812.87 km) |
| Merrifield to Ozieri | 4,383.83 mi (7,055.09 km) |
| Merrifield to Paceco | 4,638.99 mi (7,465.74 km) |
