| Key West to Opwijk | 4,746.66 mi (7,639.01 km) |
| Key West to Ostend | 4,689.23 mi (7,546.59 km) |
| Key West to Oud-Heverlee | 4,769.28 mi (7,675.42 km) |
| Key West to Oud-Turnhout | 4,774.80 mi (7,684.30 km) |
| Key West to Oudenaarde | 4,723.70 mi (7,602.07 km) |
| Key West to Oudenburg | 4,693.26 mi (7,553.07 km) |
| Key West to Oupeye | 4,812.77 mi (7,745.41 km) |
| Key West to Overijse | 4,764.43 mi (7,667.61 km) |
| Key West to Overpelt | 4,794.65 mi (7,716.24 km) |
| Key West to Paal | 4,787.32 mi (7,704.45 km) |
| Key West to Peer | 4,797.60 mi (7,720.99 km) |
| Key West to Pepinster | 4,822.57 mi (7,761.18 km) |
| Key West to Peruwelz | 4,728.11 mi (7,609.16 km) |
| Key West to Perwez | 4,779.00 mi (7,691.05 km) |
| Key West to Philippeville | 4,774.61 mi (7,684.00 km) |
