| Haarlem to Oberkirch | 306.17 mi (492.73 km) |
| Haarlem to Obernburg am Main | 262.81 mi (422.96 km) |
| Haarlem to Obernkirchen | 189.52 mi (305.00 km) |
| Haarlem to Oberschleissheim | 418.14 mi (672.94 km) |
| Haarlem to Oberstdorf | 425.44 mi (684.68 km) |
| Haarlem to Obertraubling | 405.34 mi (652.33 km) |
| Haarlem to Obertshausen | 242.10 mi (389.63 km) |
| Haarlem to Oberursel | 227.36 mi (365.90 km) |
| Haarlem to Ochsenfurt | 302.25 mi (486.43 km) |
| Haarlem to Ochsenhausen | 379.15 mi (610.18 km) |
| Haarlem to Ochtrup | 108.74 mi (175.00 km) |
| Haarlem to Odenthal | 141.43 mi (227.60 km) |
| Haarlem to Oelde | 153.98 mi (247.80 km) |
| Haarlem to Oelsnitz | 351.80 mi (566.17 km) |
| Haarlem to Oer-Erkenschwick | 122.51 mi (197.17 km) |
