| Romford to Oberkirch | 408.50 mi (657.42 km) |
| Romford to Obernburg am Main | 409.74 mi (659.42 km) |
| Romford to Obernkirchen | 383.58 mi (617.31 km) |
| Romford to Oberschleissheim | 555.54 mi (894.05 km) |
| Romford to Oberstdorf | 536.24 mi (862.99 km) |
| Romford to Obertraubling | 558.47 mi (898.78 km) |
| Romford to Obertshausen | 391.58 mi (630.19 km) |
| Romford to Oberursel | 377.84 mi (608.07 km) |
| Romford to Ochsenfurt | 453.03 mi (729.08 km) |
| Romford to Ochsenhausen | 497.63 mi (800.85 km) |
| Romford to Ochtrup | 301.94 mi (485.93 km) |
| Romford to Odenthal | 301.86 mi (485.79 km) |
| Romford to Oelde | 341.54 mi (549.66 km) |
| Romford to Oelsnitz | 526.75 mi (847.72 km) |
| Romford to Oer-Erkenschwick | 303.31 mi (488.12 km) |
