| Nieuwkoop to Octeville | 330.26 mi (531.51 km) |
| Nieuwkoop to Oignies | 141.01 mi (226.94 km) |
| Nieuwkoop to Oissel | 253.59 mi (408.11 km) |
| Nieuwkoop to Olivet | 324.36 mi (522.01 km) |
| Nieuwkoop to Ollioules | 626.87 mi (1,008.85 km) |
| Nieuwkoop to Olonne-sur-Mer | 488.30 mi (785.84 km) |
| Nieuwkoop to Oloron-Sainte-Marie | 669.02 mi (1,076.69 km) |
| Nieuwkoop to Onet Village | 549.25 mi (883.93 km) |
| Nieuwkoop to Onnaing | 133.94 mi (215.55 km) |
| Nieuwkoop to Orange | 555.86 mi (894.57 km) |
| Nieuwkoop to Orchies | 135.11 mi (217.44 km) |
| Nieuwkoop to Orleans | 321.75 mi (517.80 km) |
| Nieuwkoop to Orly | 259.53 mi (417.67 km) |
| Nieuwkoop to Ormesson-sur-Marne | 254.34 mi (409.31 km) |
| Nieuwkoop to Orsay | 266.17 mi (428.35 km) |
