| Lake Oswego to Oerlinghausen | 5,115.05 mi (8,231.88 km) |
| Lake Oswego to Oestrich-Winkel | 5,212.72 mi (8,389.07 km) |
| Lake Oswego to Offenburg | 5,299.65 mi (8,528.96 km) |
| Lake Oswego to Oftersheim | 5,263.43 mi (8,470.66 km) |
| Lake Oswego to Ohrdruf | 5,229.24 mi (8,415.65 km) |
| Lake Oswego to Ohringen | 5,295.58 mi (8,522.42 km) |
| Lake Oswego to Olbernhau | 5,297.19 mi (8,525.01 km) |
| Lake Oswego to Olching | 5,397.89 mi (8,687.06 km) |
| Lake Oswego to Oldenburg | 5,036.72 mi (8,105.81 km) |
| Lake Oswego to Oldenburg in Holstein | 5,029.03 mi (8,093.44 km) |
| Lake Oswego to Olfen | 5,099.10 mi (8,206.22 km) |
| Lake Oswego to Olpe | 5,150.09 mi (8,288.27 km) |
| Lake Oswego to Olsberg | 5,146.38 mi (8,282.30 km) |
| Lake Oswego to Oranienburg | 5,170.47 mi (8,321.07 km) |
| Lake Oswego to Ortenberg | 5,217.58 mi (8,396.89 km) |
