| West Islip to Opwijk | 3,620.79 mi (5,827.09 km) |
| West Islip to Ostend | 3,563.15 mi (5,734.33 km) |
| West Islip to Oud-Heverlee | 3,643.76 mi (5,864.06 km) |
| West Islip to Oud-Turnhout | 3,644.47 mi (5,865.20 km) |
| West Islip to Oudenaarde | 3,599.89 mi (5,793.47 km) |
| West Islip to Oudenburg | 3,567.43 mi (5,741.22 km) |
| West Islip to Oupeye | 3,686.60 mi (5,933.01 km) |
| West Islip to Overijse | 3,639.59 mi (5,857.35 km) |
| West Islip to Overpelt | 3,664.43 mi (5,897.34 km) |
| West Islip to Paal | 3,659.09 mi (5,888.73 km) |
| West Islip to Peer | 3,668.05 mi (5,903.15 km) |
| West Islip to Pepinster | 3,697.33 mi (5,950.27 km) |
| West Islip to Peruwelz | 3,607.38 mi (5,805.51 km) |
| West Islip to Perwez | 3,655.08 mi (5,882.28 km) |
| West Islip to Philippeville | 3,655.03 mi (5,882.20 km) |
