| Nieuwkoop to Oberkirch | 291.43 mi (469.01 km) |
| Nieuwkoop to Obernburg am Main | 249.68 mi (401.82 km) |
| Nieuwkoop to Obernkirchen | 184.22 mi (296.47 km) |
| Nieuwkoop to Oberschleissheim | 404.96 mi (651.71 km) |
| Nieuwkoop to Oberstdorf | 411.12 mi (661.64 km) |
| Nieuwkoop to Obertraubling | 393.22 mi (632.83 km) |
| Nieuwkoop to Obertshausen | 229.04 mi (368.60 km) |
| Nieuwkoop to Oberursel | 214.27 mi (344.84 km) |
| Nieuwkoop to Ochsenfurt | 289.60 mi (466.06 km) |
| Nieuwkoop to Ochsenhausen | 364.99 mi (587.39 km) |
| Nieuwkoop to Ochtrup | 102.65 mi (165.21 km) |
| Nieuwkoop to Odenthal | 128.37 mi (206.59 km) |
| Nieuwkoop to Oelde | 145.90 mi (234.80 km) |
| Nieuwkoop to Oelsnitz | 342.00 mi (550.39 km) |
| Nieuwkoop to Oer-Erkenschwick | 112.27 mi (180.69 km) |
