| Highlands Ranch to Olivares | 5,041.59 mi (8,113.66 km) |
| Highlands Ranch to Olivenza | 4,947.66 mi (7,962.49 km) |
| Highlands Ranch to Olot | 5,193.36 mi (8,357.90 km) |
| Highlands Ranch to Onate | 4,962.56 mi (7,986.47 km) |
| Highlands Ranch to Onda | 5,181.87 mi (8,339.42 km) |
| Highlands Ranch to Onteniente | 5,217.81 mi (8,397.26 km) |
| Highlands Ranch to Orihuela | 5,236.00 mi (8,426.52 km) |
| Highlands Ranch to Osuna | 5,095.11 mi (8,199.79 km) |
| Highlands Ranch to Ourense | 4,768.00 mi (7,673.36 km) |
| Highlands Ranch to Oviedo | 4,810.54 mi (7,741.82 km) |
| Highlands Ranch to Paiporta | 5,199.02 mi (8,367.01 km) |
| Highlands Ranch to Pajara | 5,045.35 mi (8,119.71 km) |
| Highlands Ranch to Palafolls | 5,226.62 mi (8,411.44 km) |
| Highlands Ranch to Palafrugell | 5,231.51 mi (8,419.31 km) |
| Highlands Ranch to Palamos | 5,233.42 mi (8,422.38 km) |
