| Merrick to Orbetello | 4,188.04 mi (6,740.01 km) |
| Merrick to Oria | 4,541.06 mi (7,308.14 km) |
| Merrick to Oristano | 4,157.18 mi (6,690.33 km) |
| Merrick to Orta Nova | 4,425.66 mi (7,122.41 km) |
| Merrick to Orte | 4,239.06 mi (6,822.10 km) |
| Merrick to Ortona | 4,331.12 mi (6,970.26 km) |
| Merrick to Orvieto | 4,217.95 mi (6,788.14 km) |
| Merrick to Orzinuovi | 4,033.68 mi (6,491.58 km) |
| Merrick to Osimo | 4,251.07 mi (6,841.43 km) |
| Merrick to Ospitaletto | 4,034.69 mi (6,493.21 km) |
| Merrick to Ostuni | 4,529.95 mi (7,290.26 km) |
| Merrick to Ottaviano | 4,389.08 mi (7,063.54 km) |
| Merrick to Ovada | 4,002.34 mi (6,441.15 km) |
| Merrick to Ozieri | 4,152.63 mi (6,683.01 km) |
| Merrick to Paceco | 4,407.90 mi (7,093.83 km) |
