| Modesto to Orbetello | 6,141.56 mi (9,883.89 km) |
| Modesto to Oria | 6,437.59 mi (10,360.31 km) |
| Modesto to Oristano | 6,200.21 mi (9,978.27 km) |
| Modesto to Orta Nova | 6,335.50 mi (10,196.00 km) |
| Modesto to Orte | 6,175.16 mi (9,937.95 km) |
| Modesto to Ortona | 6,239.57 mi (10,041.62 km) |
| Modesto to Orvieto | 6,152.50 mi (9,901.49 km) |
| Modesto to Orzinuovi | 5,939.12 mi (9,558.08 km) |
| Modesto to Osimo | 6,148.73 mi (9,895.42 km) |
| Modesto to Ospitaletto | 5,934.59 mi (9,550.80 km) |
| Modesto to Ostuni | 6,422.49 mi (10,336.00 km) |
| Modesto to Ottaviano | 6,327.96 mi (10,183.87 km) |
| Modesto to Ovada | 5,942.89 mi (9,564.16 km) |
| Modesto to Ozieri | 6,176.18 mi (9,939.61 km) |
| Modesto to Paceco | 6,433.22 mi (10,353.27 km) |
