| Oregon to Oerlinghausen | 4,115.26 mi (6,622.87 km) |
| Oregon to Oestrich-Winkel | 4,158.76 mi (6,692.88 km) |
| Oregon to Offenburg | 4,210.65 mi (6,776.39 km) |
| Oregon to Oftersheim | 4,203.53 mi (6,764.92 km) |
| Oregon to Ohrdruf | 4,232.07 mi (6,810.87 km) |
| Oregon to Ohringen | 4,244.85 mi (6,831.43 km) |
| Oregon to Olbernhau | 4,333.86 mi (6,974.67 km) |
| Oregon to Olching | 4,351.86 mi (7,003.64 km) |
| Oregon to Oldenburg | 4,058.60 mi (6,531.68 km) |
| Oregon to Oldenburg in Holstein | 4,113.94 mi (6,620.74 km) |
| Oregon to Olfen | 4,076.21 mi (6,560.02 km) |
| Oregon to Olpe | 4,117.01 mi (6,625.69 km) |
| Oregon to Olsberg | 4,129.83 mi (6,646.31 km) |
| Oregon to Oranienburg | 4,252.01 mi (6,842.95 km) |
| Oregon to Ortenberg | 4,186.28 mi (6,737.17 km) |
