| Lake Oswego to Oberkirch | 5,299.55 mi (8,528.80 km) |
| Lake Oswego to Obernburg am Main | 5,249.64 mi (8,448.48 km) |
| Lake Oswego to Obernkirchen | 5,108.16 mi (8,220.79 km) |
| Lake Oswego to Oberschleissheim | 5,400.85 mi (8,691.82 km) |
| Lake Oswego to Oberstdorf | 5,419.48 mi (8,721.82 km) |
| Lake Oswego to Obertraubling | 5,372.37 mi (8,645.99 km) |
| Lake Oswego to Obertshausen | 5,229.06 mi (8,415.36 km) |
| Lake Oswego to Oberursel | 5,214.96 mi (8,392.67 km) |
| Lake Oswego to Ochsenfurt | 5,282.82 mi (8,501.88 km) |
| Lake Oswego to Ochsenhausen | 5,372.47 mi (8,646.15 km) |
| Lake Oswego to Ochtrup | 5,066.53 mi (8,153.79 km) |
| Lake Oswego to Odenthal | 5,131.80 mi (8,258.83 km) |
| Lake Oswego to Oelde | 5,110.63 mi (8,224.76 km) |
| Lake Oswego to Oelsnitz | 5,286.15 mi (8,507.24 km) |
| Lake Oswego to Oer-Erkenschwick | 5,100.19 mi (8,207.97 km) |
