| Martha Lake to Orbetello | 5,583.44 mi (8,985.68 km) |
| Martha Lake to Oria | 5,856.35 mi (9,424.89 km) |
| Martha Lake to Oristano | 5,666.11 mi (9,118.72 km) |
| Martha Lake to Orta Nova | 5,760.40 mi (9,270.47 km) |
| Martha Lake to Orte | 5,611.41 mi (9,030.69 km) |
| Martha Lake to Ortona | 5,666.86 mi (9,119.93 km) |
| Martha Lake to Orvieto | 5,589.02 mi (8,994.65 km) |
| Martha Lake to Orzinuovi | 5,374.53 mi (8,649.47 km) |
| Martha Lake to Osimo | 5,575.94 mi (8,973.61 km) |
| Martha Lake to Ospitaletto | 5,368.74 mi (8,640.15 km) |
| Martha Lake to Ostuni | 5,840.69 mi (9,399.69 km) |
| Martha Lake to Ottaviano | 5,760.51 mi (9,270.65 km) |
| Martha Lake to Ovada | 5,387.33 mi (8,670.06 km) |
| Martha Lake to Ozieri | 5,636.89 mi (9,071.70 km) |
| Martha Lake to Paceco | 5,886.85 mi (9,473.96 km) |
