| Horizon City to Octeville | 5,170.43 mi (8,321.01 km) |
| Horizon City to Oignies | 5,311.58 mi (8,548.16 km) |
| Horizon City to Oissel | 5,284.65 mi (8,504.82 km) |
| Horizon City to Olivet | 5,372.09 mi (8,645.54 km) |
| Horizon City to Ollioules | 5,717.83 mi (9,201.96 km) |
| Horizon City to Olonne-sur-Mer | 5,277.60 mi (8,493.48 km) |
| Horizon City to Oloron-Sainte-Marie | 5,450.35 mi (8,771.49 km) |
| Horizon City to Onet Village | 5,536.81 mi (8,910.63 km) |
| Horizon City to Onnaing | 5,336.67 mi (8,588.54 km) |
| Horizon City to Orange | 5,634.90 mi (9,068.49 km) |
| Horizon City to Orchies | 5,320.45 mi (8,562.43 km) |
| Horizon City to Orleans | 5,370.92 mi (8,643.66 km) |
| Horizon City to Orly | 5,356.61 mi (8,620.63 km) |
| Horizon City to Ormesson-sur-Marne | 5,360.45 mi (8,626.81 km) |
| Horizon City to Orsay | 5,350.65 mi (8,611.04 km) |
