| Port Arthur to Oberkirch | 5,203.65 mi (8,374.47 km) |
| Port Arthur to Obernburg am Main | 5,201.80 mi (8,371.49 km) |
| Port Arthur to Obernkirchen | 5,120.03 mi (8,239.89 km) |
| Port Arthur to Oberschleissheim | 5,351.93 mi (8,613.09 km) |
| Port Arthur to Oberstdorf | 5,330.30 mi (8,578.29 km) |
| Port Arthur to Obertraubling | 5,349.72 mi (8,609.54 km) |
| Port Arthur to Obertshausen | 5,182.23 mi (8,339.99 km) |
| Port Arthur to Oberursel | 5,167.73 mi (8,316.66 km) |
| Port Arthur to Ochsenfurt | 5,244.22 mi (8,439.76 km) |
| Port Arthur to Ochsenhausen | 5,293.96 mi (8,519.80 km) |
| Port Arthur to Ochtrup | 5,049.89 mi (8,127.02 km) |
| Port Arthur to Odenthal | 5,084.27 mi (8,182.34 km) |
| Port Arthur to Oelde | 5,097.97 mi (8,204.39 km) |
| Port Arthur to Oelsnitz | 5,297.73 mi (8,525.87 km) |
| Port Arthur to Oer-Erkenschwick | 5,070.03 mi (8,159.43 km) |
