| Hillegom to Oberkirch | 301.39 mi (485.04 km) |
| Hillegom to Obernburg am Main | 260.06 mi (418.52 km) |
| Hillegom to Obernkirchen | 191.67 mi (308.47 km) |
| Hillegom to Oberschleissheim | 415.34 mi (668.42 km) |
| Hillegom to Oberstdorf | 421.38 mi (678.14 km) |
| Hillegom to Obertraubling | 403.45 mi (649.29 km) |
| Hillegom to Obertshausen | 239.41 mi (385.29 km) |
| Hillegom to Oberursel | 224.65 mi (361.53 km) |
| Hillegom to Ochsenfurt | 299.92 mi (482.67 km) |
| Hillegom to Ochsenhausen | 375.30 mi (603.98 km) |
| Hillegom to Ochtrup | 110.41 mi (177.70 km) |
| Hillegom to Odenthal | 138.73 mi (223.27 km) |
| Hillegom to Oelde | 154.66 mi (248.91 km) |
| Hillegom to Oelsnitz | 351.53 mi (565.73 km) |
| Hillegom to Oer-Erkenschwick | 121.89 mi (196.16 km) |
