| Great Baddow to Oberkirch | 401.03 mi (645.39 km) |
| Great Baddow to Obernburg am Main | 398.65 mi (641.56 km) |
| Great Baddow to Obernkirchen | 368.07 mi (592.36 km) |
| Great Baddow to Oberschleissheim | 545.93 mi (878.59 km) |
| Great Baddow to Oberstdorf | 528.86 mi (851.12 km) |
| Great Baddow to Obertraubling | 547.47 mi (881.06 km) |
| Great Baddow to Obertshausen | 380.16 mi (611.81 km) |
| Great Baddow to Oberursel | 366.25 mi (589.42 km) |
| Great Baddow to Ochsenfurt | 441.84 mi (711.08 km) |
| Great Baddow to Ochsenhausen | 489.41 mi (787.63 km) |
| Great Baddow to Ochtrup | 286.41 mi (460.93 km) |
| Great Baddow to Odenthal | 288.87 mi (464.89 km) |
| Great Baddow to Oelde | 326.69 mi (525.75 km) |
| Great Baddow to Oelsnitz | 513.60 mi (826.55 km) |
| Great Baddow to Oer-Erkenschwick | 288.86 mi (464.87 km) |
