| Portsmouth to Opwijk | 229.95 mi (370.07 km) |
| Portsmouth to Ostend | 176.53 mi (284.10 km) |
| Portsmouth to Oud-Heverlee | 251.11 mi (404.12 km) |
| Portsmouth to Oud-Turnhout | 265.88 mi (427.90 km) |
| Portsmouth to Oudenaarde | 204.55 mi (329.19 km) |
| Portsmouth to Oudenburg | 179.62 mi (289.07 km) |
| Portsmouth to Oupeye | 294.15 mi (473.39 km) |
| Portsmouth to Overijse | 245.42 mi (394.96 km) |
| Portsmouth to Overpelt | 284.06 mi (457.15 km) |
| Portsmouth to Paal | 273.04 mi (439.42 km) |
| Portsmouth to Peer | 285.39 mi (459.30 km) |
| Portsmouth to Pepinster | 302.56 mi (486.92 km) |
| Portsmouth to Peruwelz | 205.50 mi (330.72 km) |
| Portsmouth to Perwez | 258.45 mi (415.93 km) |
| Portsmouth to Philippeville | 251.18 mi (404.23 km) |
