| Oregon to Orbetello | 4,572.73 mi (7,359.09 km) |
| Oregon to Oria | 4,918.12 mi (7,914.95 km) |
| Oregon to Oristano | 4,562.81 mi (7,343.13 km) |
| Oregon to Orta Nova | 4,803.90 mi (7,731.14 km) |
| Oregon to Orte | 4,620.42 mi (7,435.84 km) |
| Oregon to Ortona | 4,707.46 mi (7,575.93 km) |
| Oregon to Orvieto | 4,598.59 mi (7,400.72 km) |
| Oregon to Orzinuovi | 4,404.11 mi (7,087.74 km) |
| Oregon to Osimo | 4,623.49 mi (7,440.79 km) |
| Oregon to Ospitaletto | 4,403.80 mi (7,087.23 km) |
| Oregon to Ostuni | 4,905.91 mi (7,895.29 km) |
| Oregon to Ottaviano | 4,773.52 mi (7,682.25 km) |
| Oregon to Ovada | 4,380.78 mi (7,050.19 km) |
| Oregon to Ozieri | 4,553.53 mi (7,328.20 km) |
| Oregon to Paceco | 4,812.81 mi (7,745.47 km) |
