| Horsholm to Oignies | 542.28 mi (872.72 km) |
| Horsholm to Oissel | 656.89 mi (1,057.17 km) |
| Horsholm to Olivet | 713.60 mi (1,148.43 km) |
| Horsholm to Ollioules | 928.61 mi (1,494.45 km) |
| Horsholm to Olonne-sur-Mer | 890.49 mi (1,433.11 km) |
| Horsholm to Oloron-Sainte-Marie | 1,051.65 mi (1,692.46 km) |
| Horsholm to Onet Village | 906.71 mi (1,459.21 km) |
| Horsholm to Onnaing | 528.76 mi (850.96 km) |
| Horsholm to Orange | 879.08 mi (1,414.75 km) |
| Horsholm to Orchies | 534.57 mi (860.30 km) |
| Horsholm to Orleans | 711.20 mi (1,144.56 km) |
| Horsholm to Orly | 651.13 mi (1,047.90 km) |
| Horsholm to Ormesson-sur-Marne | 644.84 mi (1,037.77 km) |
| Horsholm to Orsay | 659.31 mi (1,061.05 km) |
| Horsholm to Orthez | 1,038.00 mi (1,670.51 km) |
