| Petaluma to Orbetello | 6,154.12 mi (9,904.10 km) |
| Petaluma to Oria | 6,445.10 mi (10,372.39 km) |
| Petaluma to Oristano | 6,217.98 mi (10,006.87 km) |
| Petaluma to Orta Nova | 6,344.38 mi (10,210.29 km) |
| Petaluma to Orte | 6,186.49 mi (9,956.19 km) |
| Petaluma to Ortona | 6,248.91 mi (10,056.65 km) |
| Petaluma to Orvieto | 6,163.87 mi (9,919.79 km) |
| Petaluma to Orzinuovi | 5,950.02 mi (9,575.62 km) |
| Petaluma to Osimo | 6,157.96 mi (9,910.28 km) |
| Petaluma to Ospitaletto | 5,945.20 mi (9,567.87 km) |
| Petaluma to Ostuni | 6,429.85 mi (10,347.85 km) |
| Petaluma to Ottaviano | 6,338.61 mi (10,201.00 km) |
| Petaluma to Ovada | 5,955.81 mi (9,584.94 km) |
| Petaluma to Ozieri | 6,192.84 mi (9,966.42 km) |
| Petaluma to Paceco | 6,448.66 mi (10,378.12 km) |
