| Harenkarspel to Oerlinghausen | 172.75 mi (278.01 km) |
| Harenkarspel to Oestrich-Winkel | 234.68 mi (377.69 km) |
| Harenkarspel to Offenburg | 325.78 mi (524.30 km) |
| Harenkarspel to Oftersheim | 285.32 mi (459.18 km) |
| Harenkarspel to Ohrdruf | 286.76 mi (461.49 km) |
| Harenkarspel to Ohringen | 319.21 mi (513.72 km) |
| Harenkarspel to Olbernhau | 393.22 mi (632.82 km) |
| Harenkarspel to Olching | 425.15 mi (684.21 km) |
| Harenkarspel to Oldenburg | 146.13 mi (235.17 km) |
| Harenkarspel to Oldenburg in Holstein | 273.31 mi (439.85 km) |
| Harenkarspel to Olfen | 131.03 mi (210.87 km) |
| Harenkarspel to Olpe | 176.47 mi (284.01 km) |
| Harenkarspel to Olsberg | 184.48 mi (296.89 km) |
| Harenkarspel to Oranienburg | 353.92 mi (569.58 km) |
| Harenkarspel to Ortenberg | 246.71 mi (397.05 km) |
