| Merriam to Orbetello | 5,145.54 mi (8,280.94 km) |
| Merriam to Oria | 5,484.03 mi (8,825.70 km) |
| Merriam to Oristano | 5,148.71 mi (8,286.04 km) |
| Merriam to Orta Nova | 5,371.24 mi (8,644.17 km) |
| Merriam to Orte | 5,190.81 mi (8,353.80 km) |
| Merriam to Ortona | 5,274.04 mi (8,487.74 km) |
| Merriam to Orvieto | 5,168.63 mi (8,318.10 km) |
| Merriam to Orzinuovi | 4,968.48 mi (7,996.00 km) |
| Merriam to Osimo | 5,187.88 mi (8,349.09 km) |
| Merriam to Ospitaletto | 4,967.27 mi (7,994.05 km) |
| Merriam to Ostuni | 5,471.13 mi (8,804.93 km) |
| Merriam to Ottaviano | 5,345.16 mi (8,602.20 km) |
| Merriam to Ovada | 4,950.57 mi (7,967.18 km) |
| Merriam to Ozieri | 5,136.62 mi (8,266.60 km) |
| Merriam to Paceco | 5,397.29 mi (8,686.10 km) |
