| Opelika to Oberkirch | 4,714.80 mi (7,587.73 km) |
| Opelika to Obernburg am Main | 4,719.40 mi (7,595.15 km) |
| Opelika to Obernkirchen | 4,647.73 mi (7,479.80 km) |
| Opelika to Oberschleissheim | 4,866.68 mi (7,832.16 km) |
| Opelika to Oberstdorf | 4,840.16 mi (7,789.48 km) |
| Opelika to Obertraubling | 4,868.07 mi (7,834.41 km) |
| Opelika to Obertshausen | 4,700.33 mi (7,564.45 km) |
| Opelika to Oberursel | 4,686.05 mi (7,541.47 km) |
| Opelika to Ochsenfurt | 4,762.32 mi (7,664.21 km) |
| Opelika to Ochsenhausen | 4,805.81 mi (7,734.21 km) |
| Opelika to Ochtrup | 4,574.84 mi (7,362.49 km) |
| Opelika to Odenthal | 4,604.13 mi (7,409.62 km) |
| Opelika to Oelde | 4,622.53 mi (7,439.24 km) |
| Opelika to Oelsnitz | 4,821.87 mi (7,760.04 km) |
| Opelika to Oer-Erkenschwick | 4,592.62 mi (7,391.11 km) |
