| West Carson to Orbetello | 6,275.42 mi (10,099.32 km) |
| West Carson to Oria | 6,584.53 mi (10,596.77 km) |
| West Carson to Oristano | 6,318.99 mi (10,169.43 km) |
| West Carson to Orta Nova | 6,479.00 mi (10,426.94 km) |
| West Carson to Orte | 6,312.34 mi (10,158.73 km) |
| West Carson to Ortona | 6,382.09 mi (10,270.99 km) |
| West Carson to Orvieto | 6,289.66 mi (10,122.23 km) |
| West Carson to Orzinuovi | 6,078.26 mi (9,782.02 km) |
| West Carson to Osimo | 6,291.83 mi (10,125.72 km) |
| West Carson to Ospitaletto | 6,074.56 mi (9,776.05 km) |
| West Carson to Ostuni | 6,569.88 mi (10,573.20 km) |
| West Carson to Ottaviano | 6,466.58 mi (10,406.95 km) |
| West Carson to Ovada | 6,076.41 mi (9,779.03 km) |
| West Carson to Ozieri | 6,298.25 mi (10,136.05 km) |
| West Carson to Paceco | 6,557.94 mi (10,553.99 km) |
