| West Sacramento to Orbetello | 6,104.56 mi (9,824.34 km) |
| West Sacramento to Oria | 6,397.57 mi (10,295.89 km) |
| West Sacramento to Oristano | 6,166.47 mi (9,923.97 km) |
| West Sacramento to Orta Nova | 6,296.28 mi (10,132.88 km) |
| West Sacramento to Orte | 6,137.40 mi (9,877.20 km) |
| West Sacramento to Ortona | 6,200.62 mi (9,978.94 km) |
| West Sacramento to Orvieto | 6,114.77 mi (9,840.77 km) |
| West Sacramento to Orzinuovi | 5,901.08 mi (9,496.87 km) |
| West Sacramento to Osimo | 6,109.71 mi (9,832.62 km) |
| West Sacramento to Ospitaletto | 5,896.38 mi (9,489.30 km) |
| West Sacramento to Ostuni | 6,382.38 mi (10,271.45 km) |
| West Sacramento to Ottaviano | 6,289.80 mi (10,122.46 km) |
| West Sacramento to Ovada | 5,906.09 mi (9,504.93 km) |
| West Sacramento to Ozieri | 6,141.73 mi (9,884.16 km) |
| West Sacramento to Paceco | 6,398.02 mi (10,296.62 km) |
