| Highlands Ranch to Octeville | 4,718.55 mi (7,593.77 km) |
| Highlands Ranch to Oignies | 4,846.54 mi (7,799.75 km) |
| Highlands Ranch to Oissel | 4,828.41 mi (7,770.57 km) |
| Highlands Ranch to Olivet | 4,920.76 mi (7,919.19 km) |
| Highlands Ranch to Ollioules | 5,277.94 mi (8,494.02 km) |
| Highlands Ranch to Olonne-sur-Mer | 4,840.98 mi (7,790.81 km) |
| Highlands Ranch to Oloron-Sainte-Marie | 5,027.57 mi (8,091.10 km) |
| Highlands Ranch to Onet Village | 5,099.90 mi (8,207.50 km) |
| Highlands Ranch to Onnaing | 4,870.76 mi (7,838.74 km) |
| Highlands Ranch to Orange | 5,193.29 mi (8,357.80 km) |
| Highlands Ranch to Orchies | 4,854.88 mi (7,813.18 km) |
| Highlands Ranch to Orleans | 4,919.39 mi (7,916.99 km) |
| Highlands Ranch to Orly | 4,900.27 mi (7,886.22 km) |
| Highlands Ranch to Ormesson-sur-Marne | 4,903.61 mi (7,891.59 km) |
| Highlands Ranch to Orsay | 4,894.95 mi (7,877.67 km) |
