| Corvallis to Orbetello | 5,801.44 mi (9,336.51 km) |
| Corvallis to Oria | 6,078.59 mi (9,782.54 km) |
| Corvallis to Oristano | 5,879.63 mi (9,462.35 km) |
| Corvallis to Orta Nova | 5,981.54 mi (9,626.36 km) |
| Corvallis to Orte | 5,830.44 mi (9,383.19 km) |
| Corvallis to Ortona | 5,887.52 mi (9,475.04 km) |
| Corvallis to Orvieto | 5,807.99 mi (9,347.05 km) |
| Corvallis to Orzinuovi | 5,593.51 mi (9,001.89 km) |
| Corvallis to Osimo | 5,796.54 mi (9,328.63 km) |
| Corvallis to Ospitaletto | 5,587.94 mi (8,992.92 km) |
| Corvallis to Ostuni | 6,063.01 mi (9,757.47 km) |
| Corvallis to Ottaviano | 5,980.33 mi (9,624.41 km) |
| Corvallis to Ovada | 5,604.67 mi (9,019.84 km) |
| Corvallis to Ozieri | 5,851.40 mi (9,416.91 km) |
| Corvallis to Paceco | 6,102.95 mi (9,821.75 km) |
