| Oostzaan to Orbetello | 750.49 mi (1,207.80 km) |
| Oostzaan to Oria | 1,020.50 mi (1,642.34 km) |
| Oostzaan to Oristano | 883.26 mi (1,421.47 km) |
| Oostzaan to Orta Nova | 919.73 mi (1,480.16 km) |
| Oostzaan to Orte | 772.14 mi (1,242.64 km) |
| Oostzaan to Ortona | 825.20 mi (1,328.03 km) |
| Oostzaan to Orvieto | 750.14 mi (1,207.23 km) |
| Oostzaan to Orzinuovi | 537.01 mi (864.24 km) |
| Oostzaan to Osimo | 734.21 mi (1,181.60 km) |
| Oostzaan to Ospitaletto | 529.95 mi (852.87 km) |
| Oostzaan to Ostuni | 1,005.45 mi (1,618.11 km) |
| Oostzaan to Ottaviano | 918.87 mi (1,478.77 km) |
| Oostzaan to Ovada | 565.17 mi (909.55 km) |
| Oostzaan to Ozieri | 841.40 mi (1,354.11 km) |
| Oostzaan to Paceco | 1,064.41 mi (1,713.01 km) |
