| Duncan to Opwijk | 4,880.15 mi (7,853.85 km) |
| Duncan to Ostend | 4,823.91 mi (7,763.33 km) |
| Duncan to Oud-Heverlee | 4,902.93 mi (7,890.50 km) |
| Duncan to Oud-Turnhout | 4,897.02 mi (7,881.00 km) |
| Duncan to Oudenaarde | 4,862.59 mi (7,825.59 km) |
| Duncan to Oudenburg | 4,828.40 mi (7,770.56 km) |
| Duncan to Oupeye | 4,943.66 mi (7,956.06 km) |
| Duncan to Overijse | 4,899.79 mi (7,885.44 km) |
| Duncan to Overpelt | 4,916.58 mi (7,912.46 km) |
| Duncan to Paal | 4,914.13 mi (7,908.52 km) |
| Duncan to Peer | 4,921.01 mi (7,919.61 km) |
| Duncan to Pepinster | 4,955.33 mi (7,974.84 km) |
| Duncan to Peruwelz | 4,873.85 mi (7,843.71 km) |
| Duncan to Perwez | 4,916.06 mi (7,911.63 km) |
| Duncan to Philippeville | 4,921.62 mi (7,920.58 km) |
