| Havre de Grace to Opwijk | 3,786.31 mi (6,093.48 km) |
| Havre de Grace to Ostend | 3,728.70 mi (6,000.76 km) |
| Havre de Grace to Oud-Heverlee | 3,809.29 mi (6,130.46 km) |
| Havre de Grace to Oud-Turnhout | 3,809.61 mi (6,130.97 km) |
| Havre de Grace to Oudenaarde | 3,765.59 mi (6,060.14 km) |
| Havre de Grace to Oudenburg | 3,733.00 mi (6,007.68 km) |
| Havre de Grace to Oupeye | 3,852.05 mi (6,199.27 km) |
| Havre de Grace to Overijse | 3,805.18 mi (6,123.84 km) |
| Havre de Grace to Overpelt | 3,829.57 mi (6,163.09 km) |
| Havre de Grace to Paal | 3,824.39 mi (6,154.76 km) |
| Havre de Grace to Peer | 3,833.24 mi (6,169.00 km) |
| Havre de Grace to Pepinster | 3,862.84 mi (6,216.64 km) |
| Havre de Grace to Peruwelz | 3,773.30 mi (6,072.54 km) |
| Havre de Grace to Perwez | 3,820.73 mi (6,148.86 km) |
| Havre de Grace to Philippeville | 3,821.00 mi (6,149.30 km) |
