| American Canyon to Orbetello | 6,147.11 mi (9,892.82 km) |
| American Canyon to Oria | 6,439.11 mi (10,362.74 km) |
| American Canyon to Oristano | 6,209.94 mi (9,993.93 km) |
| American Canyon to Orta Nova | 6,338.10 mi (10,200.19 km) |
| American Canyon to Orte | 6,179.72 mi (9,945.30 km) |
| American Canyon to Ortona | 6,242.54 mi (10,046.40 km) |
| American Canyon to Orvieto | 6,157.09 mi (9,908.88 km) |
| American Canyon to Orzinuovi | 5,943.32 mi (9,564.85 km) |
| American Canyon to Osimo | 6,151.61 mi (9,900.05 km) |
| American Canyon to Ospitaletto | 5,938.56 mi (9,557.19 km) |
| American Canyon to Ostuni | 6,423.89 mi (10,338.25 km) |
| American Canyon to Ottaviano | 6,331.98 mi (10,190.34 km) |
| American Canyon to Ovada | 5,948.71 mi (9,573.53 km) |
| American Canyon to Ozieri | 6,185.02 mi (9,953.83 km) |
| American Canyon to Paceco | 6,441.09 mi (10,365.93 km) |
