| Berkhampstead to Oberkirch | 442.48 mi (712.11 km) |
| Berkhampstead to Obernburg am Main | 443.54 mi (713.81 km) |
| Berkhampstead to Obernkirchen | 412.73 mi (664.22 km) |
| Berkhampstead to Oberschleissheim | 589.66 mi (948.97 km) |
| Berkhampstead to Oberstdorf | 570.18 mi (917.61 km) |
| Berkhampstead to Obertraubling | 592.32 mi (953.24 km) |
| Berkhampstead to Obertshausen | 425.25 mi (684.38 km) |
| Berkhampstead to Oberursel | 411.43 mi (662.13 km) |
| Berkhampstead to Ochsenfurt | 486.80 mi (783.43 km) |
| Berkhampstead to Ochsenhausen | 531.72 mi (855.73 km) |
| Berkhampstead to Ochtrup | 331.08 mi (532.83 km) |
| Berkhampstead to Odenthal | 334.56 mi (538.42 km) |
| Berkhampstead to Oelde | 372.00 mi (598.68 km) |
| Berkhampstead to Oelsnitz | 559.32 mi (900.14 km) |
| Berkhampstead to Oer-Erkenschwick | 334.41 mi (538.18 km) |
