| Highlands Ranch to Opwijk | 4,865.30 mi (7,829.94 km) |
| Highlands Ranch to Ostend | 4,811.38 mi (7,743.17 km) |
| Highlands Ranch to Oud-Heverlee | 4,887.41 mi (7,865.53 km) |
| Highlands Ranch to Oud-Turnhout | 4,876.63 mi (7,848.17 km) |
| Highlands Ranch to Oudenaarde | 4,850.70 mi (7,806.44 km) |
| Highlands Ranch to Oudenburg | 4,815.94 mi (7,750.51 km) |
| Highlands Ranch to Oupeye | 4,925.63 mi (7,927.04 km) |
| Highlands Ranch to Overijse | 4,885.13 mi (7,861.86 km) |
| Highlands Ranch to Overpelt | 4,895.43 mi (7,878.44 km) |
| Highlands Ranch to Paal | 4,895.22 mi (7,878.09 km) |
| Highlands Ranch to Peer | 4,900.39 mi (7,886.41 km) |
| Highlands Ranch to Pepinster | 4,937.77 mi (7,946.57 km) |
| Highlands Ranch to Peruwelz | 4,864.64 mi (7,828.88 km) |
| Highlands Ranch to Perwez | 4,901.64 mi (7,888.43 km) |
| Highlands Ranch to Philippeville | 4,911.45 mi (7,904.21 km) |
