| Nieuwkoop to Navodari | 1,216.55 mi (1,957.85 km) |
| Nieuwkoop to Negresti-Oas | 877.17 mi (1,411.67 km) |
| Nieuwkoop to Nehoiu | 1,082.94 mi (1,742.83 km) |
| Nieuwkoop to Ocna Mures | 945.27 mi (1,521.27 km) |
| Nieuwkoop to Odobesti | 1,098.50 mi (1,767.87 km) |
| Nieuwkoop to Odorheiu Secuiesc | 1,006.58 mi (1,619.94 km) |
| Nieuwkoop to Oltenita | 1,146.76 mi (1,845.53 km) |
| Nieuwkoop to Onesti | 1,068.69 mi (1,719.89 km) |
| Nieuwkoop to Oradea | 842.36 mi (1,355.65 km) |
| Nieuwkoop to Orastie | 939.27 mi (1,511.60 km) |
| Nieuwkoop to Oravita | 913.61 mi (1,470.32 km) |
| Nieuwkoop to Orsova | 954.37 mi (1,535.91 km) |
| Nieuwkoop to Otelu Rosu | 919.20 mi (1,479.30 km) |
| Nieuwkoop to Otopeni | 1,105.20 mi (1,778.65 km) |
| Nieuwkoop to Ovidiu | 1,216.42 mi (1,957.64 km) |
