| Harenkarspel to Oberkirch | 324.46 mi (522.17 km) |
| Harenkarspel to Obernburg am Main | 274.98 mi (442.53 km) |
| Harenkarspel to Obernkirchen | 185.65 mi (298.78 km) |
| Harenkarspel to Oberschleissheim | 430.04 mi (692.08 km) |
| Harenkarspel to Oberstdorf | 441.33 mi (710.25 km) |
| Harenkarspel to Obertraubling | 414.25 mi (666.67 km) |
| Harenkarspel to Obertshausen | 254.17 mi (409.05 km) |
| Harenkarspel to Oberursel | 239.57 mi (385.54 km) |
| Harenkarspel to Ochsenfurt | 312.91 mi (503.58 km) |
| Harenkarspel to Ochsenhausen | 394.43 mi (634.78 km) |
| Harenkarspel to Ochtrup | 108.19 mi (174.12 km) |
| Harenkarspel to Odenthal | 154.34 mi (248.39 km) |
| Harenkarspel to Oelde | 155.80 mi (250.73 km) |
| Harenkarspel to Oelsnitz | 355.45 mi (572.04 km) |
| Harenkarspel to Oer-Erkenschwick | 129.34 mi (208.15 km) |
