| Foster City to Orbetello | 6,183.76 mi (9,951.80 km) |
| Foster City to Oria | 6,476.89 mi (10,423.55 km) |
| Foster City to Oristano | 6,245.31 mi (10,050.86 km) |
| Foster City to Orta Nova | 6,375.59 mi (10,260.52 km) |
| Foster City to Orte | 6,216.65 mi (10,004.74 km) |
| Foster City to Ortona | 6,279.93 mi (10,106.56 km) |
| Foster City to Orvieto | 6,194.02 mi (9,968.31 km) |
| Foster City to Orzinuovi | 5,980.35 mi (9,624.44 km) |
| Foster City to Osimo | 6,189.01 mi (9,960.25 km) |
| Foster City to Ospitaletto | 5,975.65 mi (9,616.88 km) |
| Foster City to Ostuni | 6,461.70 mi (10,399.11 km) |
| Foster City to Ottaviano | 6,369.08 mi (10,250.04 km) |
| Foster City to Ovada | 5,985.27 mi (9,632.36 km) |
| Foster City to Ozieri | 6,220.67 mi (10,011.21 km) |
| Foster City to Paceco | 6,477.05 mi (10,423.81 km) |
