| Fort Collins to Opwijk | 4,814.65 mi (7,748.44 km) |
| Fort Collins to Ostend | 4,761.01 mi (7,662.10 km) |
| Fort Collins to Oud-Heverlee | 4,836.68 mi (7,783.89 km) |
| Fort Collins to Oud-Turnhout | 4,825.46 mi (7,765.83 km) |
| Fort Collins to Oudenaarde | 4,800.34 mi (7,725.40 km) |
| Fort Collins to Oudenburg | 4,765.57 mi (7,669.44 km) |
| Fort Collins to Oupeye | 4,874.64 mi (7,844.98 km) |
| Fort Collins to Overijse | 4,834.49 mi (7,780.36 km) |
| Fort Collins to Overpelt | 4,844.18 mi (7,795.95 km) |
| Fort Collins to Paal | 4,844.17 mi (7,795.94 km) |
| Fort Collins to Peer | 4,849.18 mi (7,804.00 km) |
| Fort Collins to Pepinster | 4,886.81 mi (7,864.56 km) |
| Fort Collins to Peruwelz | 4,814.52 mi (7,748.23 km) |
| Fort Collins to Perwez | 4,851.01 mi (7,806.94 km) |
| Fort Collins to Philippeville | 4,861.20 mi (7,823.34 km) |
