| Mill Valley to Orbetello | 6,171.19 mi (9,931.57 km) |
| Mill Valley to Oria | 6,462.99 mi (10,401.18 km) |
| Mill Valley to Oristano | 6,234.15 mi (10,032.89 km) |
| Mill Valley to Orta Nova | 6,362.05 mi (10,238.73 km) |
| Mill Valley to Orte | 6,203.76 mi (9,983.98 km) |
| Mill Valley to Ortona | 6,266.51 mi (10,084.97 km) |
| Mill Valley to Orvieto | 6,181.13 mi (9,947.57 km) |
| Mill Valley to Orzinuovi | 5,967.34 mi (9,603.51 km) |
| Mill Valley to Osimo | 6,175.57 mi (9,938.61 km) |
| Mill Valley to Ospitaletto | 5,962.57 mi (9,595.83 km) |
| Mill Valley to Ostuni | 6,447.77 mi (10,376.68 km) |
| Mill Valley to Ottaviano | 6,355.99 mi (10,228.99 km) |
| Mill Valley to Ovada | 5,972.80 mi (9,612.30 km) |
| Mill Valley to Ozieri | 6,209.21 mi (9,992.75 km) |
| Mill Valley to Paceco | 6,465.25 mi (10,404.81 km) |
