| Oceanside to Orbetello | 6,276.75 mi (10,101.46 km) |
| Oceanside to Oria | 6,589.02 mi (10,604.00 km) |
| Oceanside to Oristano | 6,316.45 mi (10,165.35 km) |
| Oceanside to Orta Nova | 6,482.67 mi (10,432.86 km) |
| Oceanside to Orte | 6,314.50 mi (10,162.21 km) |
| Oceanside to Ortona | 6,385.58 mi (10,276.60 km) |
| Oceanside to Orvieto | 6,291.83 mi (10,125.72 km) |
| Oceanside to Orzinuovi | 6,081.11 mi (9,786.60 km) |
| Oceanside to Osimo | 6,295.54 mi (10,131.69 km) |
| Oceanside to Ospitaletto | 6,077.62 mi (9,780.98 km) |
| Oceanside to Ostuni | 6,574.50 mi (10,580.64 km) |
| Oceanside to Ottaviano | 6,468.99 mi (10,410.83 km) |
| Oceanside to Ovada | 6,077.80 mi (9,781.27 km) |
| Oceanside to Ozieri | 6,296.56 mi (10,133.33 km) |
| Oceanside to Paceco | 6,556.72 mi (10,552.02 km) |
