| Harlingen to Octeville | 390.76 mi (628.87 km) |
| Harlingen to Oignies | 213.79 mi (344.06 km) |
| Harlingen to Oissel | 324.27 mi (521.87 km) |
| Harlingen to Olivet | 398.11 mi (640.70 km) |
| Harlingen to Ollioules | 693.56 mi (1,116.18 km) |
| Harlingen to Olonne-sur-Mer | 559.03 mi (899.67 km) |
| Harlingen to Oloron-Sainte-Marie | 742.78 mi (1,195.39 km) |
| Harlingen to Onet Village | 621.97 mi (1,000.97 km) |
| Harlingen to Onnaing | 207.74 mi (334.32 km) |
| Harlingen to Orange | 624.91 mi (1,005.69 km) |
| Harlingen to Orchies | 208.46 mi (335.48 km) |
| Harlingen to Orleans | 395.49 mi (636.48 km) |
| Harlingen to Orly | 333.26 mi (536.33 km) |
| Harlingen to Ormesson-sur-Marne | 328.11 mi (528.05 km) |
| Harlingen to Orsay | 339.80 mi (546.85 km) |
