| Horn Lake to Opwijk | 4,559.47 mi (7,337.75 km) |
| Horn Lake to Ostend | 4,502.34 mi (7,245.81 km) |
| Horn Lake to Oud-Heverlee | 4,582.43 mi (7,374.70 km) |
| Horn Lake to Oud-Turnhout | 4,579.58 mi (7,370.12 km) |
| Horn Lake to Oudenaarde | 4,540.27 mi (7,306.86 km) |
| Horn Lake to Oudenburg | 4,506.75 mi (7,252.91 km) |
| Horn Lake to Oupeye | 4,624.32 mi (7,442.12 km) |
| Horn Lake to Overijse | 4,578.79 mi (7,368.85 km) |
| Horn Lake to Overpelt | 4,599.41 mi (7,402.03 km) |
| Horn Lake to Paal | 4,595.60 mi (7,395.91 km) |
| Horn Lake to Peer | 4,603.48 mi (7,408.59 km) |
| Horn Lake to Pepinster | 4,635.60 mi (7,460.27 km) |
| Horn Lake to Peruwelz | 4,549.80 mi (7,322.20 km) |
| Horn Lake to Perwez | 4,594.76 mi (7,394.56 km) |
| Horn Lake to Philippeville | 4,597.70 mi (7,399.28 km) |
