| Haarlem to Orbetello | 752.03 mi (1,210.27 km) |
| Haarlem to Oria | 1,024.90 mi (1,649.42 km) |
| Haarlem to Oristano | 882.34 mi (1,419.99 km) |
| Haarlem to Orta Nova | 923.53 mi (1,486.28 km) |
| Haarlem to Orte | 774.48 mi (1,246.40 km) |
| Haarlem to Ortona | 828.72 mi (1,333.69 km) |
| Haarlem to Orvieto | 752.39 mi (1,210.86 km) |
| Haarlem to Orzinuovi | 538.88 mi (867.25 km) |
| Haarlem to Osimo | 737.71 mi (1,187.23 km) |
| Haarlem to Ospitaletto | 532.04 mi (856.23 km) |
| Haarlem to Ostuni | 1,009.91 mi (1,625.30 km) |
| Haarlem to Ottaviano | 921.83 mi (1,483.54 km) |
| Haarlem to Ovada | 565.49 mi (910.07 km) |
| Haarlem to Ozieri | 840.88 mi (1,353.27 km) |
| Haarlem to Paceco | 1,065.49 mi (1,714.74 km) |
