| Ostrow Wielkopolski to Octeville | 861.43 mi (1,386.33 km) |
| Ostrow Wielkopolski to Oignies | 647.70 mi (1,042.37 km) |
| Ostrow Wielkopolski to Oissel | 750.42 mi (1,207.68 km) |
| Ostrow Wielkopolski to Olivet | 755.16 mi (1,215.32 km) |
| Ostrow Wielkopolski to Ollioules | 809.88 mi (1,303.38 km) |
| Ostrow Wielkopolski to Olonne-sur-Mer | 950.46 mi (1,529.62 km) |
| Ostrow Wielkopolski to Oloron-Sainte-Marie | 1,036.06 mi (1,667.38 km) |
| Ostrow Wielkopolski to Onet Village | 862.38 mi (1,387.86 km) |
| Ostrow Wielkopolski to Onnaing | 623.09 mi (1,002.76 km) |
| Ostrow Wielkopolski to Orange | 793.17 mi (1,276.49 km) |
| Ostrow Wielkopolski to Orchies | 636.88 mi (1,024.95 km) |
| Ostrow Wielkopolski to Orleans | 753.64 mi (1,212.87 km) |
| Ostrow Wielkopolski to Orly | 709.57 mi (1,141.95 km) |
| Ostrow Wielkopolski to Ormesson-sur-Marne | 702.35 mi (1,130.32 km) |
| Ostrow Wielkopolski to Orsay | 719.43 mi (1,157.82 km) |
