| Halfway to Octeville | 3,644.02 mi (5,864.49 km) |
| Halfway to Oignies | 3,814.99 mi (6,139.63 km) |
| Halfway to Oissel | 3,765.70 mi (6,060.31 km) |
| Halfway to Olivet | 3,838.98 mi (6,178.24 km) |
| Halfway to Ollioules | 4,152.48 mi (6,682.77 km) |
| Halfway to Olonne-sur-Mer | 3,715.16 mi (5,978.98 km) |
| Halfway to Oloron-Sainte-Marie | 3,859.54 mi (6,211.33 km) |
| Halfway to Onet Village | 3,969.37 mi (6,388.09 km) |
| Halfway to Onnaing | 3,841.73 mi (6,182.66 km) |
| Halfway to Orange | 4,074.63 mi (6,557.49 km) |
| Halfway to Orchies | 3,825.04 mi (6,155.81 km) |
| Halfway to Orleans | 3,838.28 mi (6,177.12 km) |
| Halfway to Orly | 3,835.93 mi (6,173.34 km) |
| Halfway to Ormesson-sur-Marne | 3,840.90 mi (6,181.34 km) |
| Halfway to Orsay | 3,828.55 mi (6,161.45 km) |
