| Den Helder to Oberkirch | 337.06 mi (542.45 km) |
| Den Helder to Obernburg am Main | 285.43 mi (459.36 km) |
| Den Helder to Obernkirchen | 188.97 mi (304.11 km) |
| Den Helder to Oberschleissheim | 440.20 mi (708.43 km) |
| Den Helder to Oberstdorf | 453.05 mi (729.11 km) |
| Den Helder to Obertraubling | 423.15 mi (681.00 km) |
| Den Helder to Obertshausen | 264.63 mi (425.88 km) |
| Den Helder to Oberursel | 250.11 mi (402.52 km) |
| Den Helder to Ochsenfurt | 322.69 mi (519.32 km) |
| Den Helder to Ochsenhausen | 405.96 mi (653.32 km) |
| Den Helder to Ochtrup | 114.14 mi (183.69 km) |
| Den Helder to Odenthal | 165.44 mi (266.25 km) |
| Den Helder to Oelde | 162.26 mi (261.14 km) |
| Den Helder to Oelsnitz | 361.99 mi (582.56 km) |
| Den Helder to Oer-Erkenschwick | 138.29 mi (222.56 km) |
