| Ferney-Voltaire to Opwijk | 337.13 mi (542.55 km) |
| Ferney-Voltaire to Ostend | 372.77 mi (599.92 km) |
| Ferney-Voltaire to Oud-Heverlee | 323.06 mi (519.91 km) |
| Ferney-Voltaire to Oud-Turnhout | 353.39 mi (568.73 km) |
| Ferney-Voltaire to Oudenaarde | 337.47 mi (543.10 km) |
| Ferney-Voltaire to Oudenburg | 368.67 mi (593.32 km) |
| Ferney-Voltaire to Oupeye | 308.37 mi (496.28 km) |
| Ferney-Voltaire to Overijse | 320.99 mi (516.59 km) |
| Ferney-Voltaire to Overpelt | 344.21 mi (553.95 km) |
| Ferney-Voltaire to Paal | 333.24 mi (536.30 km) |
| Ferney-Voltaire to Peer | 338.28 mi (544.41 km) |
| Ferney-Voltaire to Pepinster | 298.15 mi (479.83 km) |
| Ferney-Voltaire to Peruwelz | 316.33 mi (509.08 km) |
| Ferney-Voltaire to Perwez | 307.57 mi (494.99 km) |
| Ferney-Voltaire to Philippeville | 281.78 mi (453.48 km) |
