| Western Springs to Octeville | 3,963.31 mi (6,378.33 km) |
| Western Springs to Oignies | 4,114.89 mi (6,622.27 km) |
| Western Springs to Oissel | 4,080.35 mi (6,566.68 km) |
| Western Springs to Olivet | 4,163.74 mi (6,700.89 km) |
| Western Springs to Ollioules | 4,501.50 mi (7,244.47 km) |
| Western Springs to Olonne-sur-Mer | 4,060.84 mi (6,535.29 km) |
| Western Springs to Oloron-Sainte-Marie | 4,227.84 mi (6,804.05 km) |
| Western Springs to Onet Village | 4,319.50 mi (6,951.56 km) |
| Western Springs to Onnaing | 4,140.69 mi (6,663.79 km) |
| Western Springs to Orange | 4,419.68 mi (7,112.78 km) |
| Western Springs to Orchies | 4,124.22 mi (6,637.29 km) |
| Western Springs to Orleans | 4,162.70 mi (6,699.22 km) |
| Western Springs to Orly | 4,152.07 mi (6,682.11 km) |
| Western Springs to Ormesson-sur-Marne | 4,156.29 mi (6,688.89 km) |
| Western Springs to Orsay | 4,145.63 mi (6,671.74 km) |
