| Wassenaar to Orbetello | 742.23 mi (1,194.50 km) |
| Wassenaar to Oria | 1,019.69 mi (1,641.03 km) |
| Wassenaar to Oristano | 869.18 mi (1,398.81 km) |
| Wassenaar to Orta Nova | 917.29 mi (1,476.24 km) |
| Wassenaar to Orte | 765.89 mi (1,232.58 km) |
| Wassenaar to Ortona | 822.03 mi (1,322.92 km) |
| Wassenaar to Orvieto | 743.70 mi (1,196.86 km) |
| Wassenaar to Orzinuovi | 529.72 mi (852.50 km) |
| Wassenaar to Osimo | 731.03 mi (1,176.47 km) |
| Wassenaar to Ospitaletto | 523.21 mi (842.03 km) |
| Wassenaar to Ostuni | 1,004.82 mi (1,617.10 km) |
| Wassenaar to Ottaviano | 914.20 mi (1,471.26 km) |
| Wassenaar to Ovada | 554.06 mi (891.68 km) |
| Wassenaar to Ozieri | 828.23 mi (1,332.90 km) |
| Wassenaar to Paceco | 1,054.94 mi (1,697.76 km) |
