| Carson City to Orbetello | 6,016.84 mi (9,683.17 km) |
| Carson City to Oria | 6,312.98 mi (10,159.76 km) |
| Carson City to Oristano | 6,075.73 mi (9,777.95 km) |
| Carson City to Orta Nova | 6,210.83 mi (9,995.36 km) |
| Carson City to Orte | 6,050.43 mi (9,737.23 km) |
| Carson City to Ortona | 6,114.88 mi (9,840.95 km) |
| Carson City to Orvieto | 6,027.78 mi (9,700.77 km) |
| Carson City to Orzinuovi | 5,814.40 mi (9,357.37 km) |
| Carson City to Osimo | 6,024.04 mi (9,694.76 km) |
| Carson City to Ospitaletto | 5,809.87 mi (9,350.09 km) |
| Carson City to Ostuni | 6,297.89 mi (10,135.47 km) |
| Carson City to Ottaviano | 6,203.24 mi (9,983.16 km) |
| Carson City to Ovada | 5,818.18 mi (9,363.45 km) |
| Carson City to Ozieri | 6,051.62 mi (9,739.14 km) |
| Carson City to Paceco | 6,308.59 mi (10,152.70 km) |
