| Santa Monica to Orbetello | 6,270.15 mi (10,090.83 km) |
| Santa Monica to Oria | 6,578.49 mi (10,587.05 km) |
| Santa Monica to Oristano | 6,314.64 mi (10,162.43 km) |
| Santa Monica to Orta Nova | 6,473.16 mi (10,417.54 km) |
| Santa Monica to Orte | 6,306.87 mi (10,149.92 km) |
| Santa Monica to Ortona | 6,376.30 mi (10,261.66 km) |
| Santa Monica to Orvieto | 6,284.19 mi (10,113.42 km) |
| Santa Monica to Orzinuovi | 6,072.64 mi (9,772.97 km) |
| Santa Monica to Osimo | 6,285.99 mi (10,116.32 km) |
| Santa Monica to Ospitaletto | 6,068.88 mi (9,766.92 km) |
| Santa Monica to Ostuni | 6,563.81 mi (10,563.43 km) |
| Santa Monica to Ottaviano | 6,461.04 mi (10,398.04 km) |
| Santa Monica to Ovada | 6,071.13 mi (9,770.53 km) |
| Santa Monica to Ozieri | 6,293.70 mi (10,128.73 km) |
| Santa Monica to Paceco | 6,553.27 mi (10,546.46 km) |
