| Millbrae to Orbetello | 6,185.18 mi (9,954.08 km) |
| Millbrae to Oria | 6,477.90 mi (10,425.17 km) |
| Millbrae to Oristano | 6,247.16 mi (10,053.83 km) |
| Millbrae to Orta Nova | 6,376.71 mi (10,262.32 km) |
| Millbrae to Orte | 6,217.97 mi (10,006.86 km) |
| Millbrae to Ortona | 6,281.08 mi (10,108.43 km) |
| Millbrae to Orvieto | 6,195.34 mi (9,970.44 km) |
| Millbrae to Orzinuovi | 5,981.63 mi (9,626.51 km) |
| Millbrae to Osimo | 6,190.16 mi (9,962.10 km) |
| Millbrae to Ospitaletto | 5,976.91 mi (9,618.91 km) |
| Millbrae to Ostuni | 6,462.70 mi (10,400.71 km) |
| Millbrae to Ottaviano | 6,370.34 mi (10,252.07 km) |
| Millbrae to Ovada | 5,986.72 mi (9,634.70 km) |
| Millbrae to Ozieri | 6,222.43 mi (10,014.03 km) |
| Millbrae to Paceco | 6,478.71 mi (10,426.47 km) |
