| Port Neches to Oberkirch | 5,198.22 mi (8,365.72 km) |
| Port Neches to Obernburg am Main | 5,196.20 mi (8,362.47 km) |
| Port Neches to Obernkirchen | 5,114.19 mi (8,230.49 km) |
| Port Neches to Oberschleissheim | 5,346.39 mi (8,604.18 km) |
| Port Neches to Oberstdorf | 5,324.90 mi (8,569.60 km) |
| Port Neches to Obertraubling | 5,344.09 mi (8,600.48 km) |
| Port Neches to Obertshausen | 5,176.61 mi (8,330.95 km) |
| Port Neches to Oberursel | 5,162.11 mi (8,307.61 km) |
| Port Neches to Ochsenfurt | 5,238.61 mi (8,430.72 km) |
| Port Neches to Ochsenhausen | 5,288.50 mi (8,511.02 km) |
| Port Neches to Ochtrup | 5,044.12 mi (8,117.73 km) |
| Port Neches to Odenthal | 5,078.61 mi (8,173.24 km) |
| Port Neches to Oelde | 5,092.20 mi (8,195.11 km) |
| Port Neches to Oelsnitz | 5,291.96 mi (8,516.59 km) |
| Port Neches to Oer-Erkenschwick | 5,064.31 mi (8,150.22 km) |
