| Hemel Hempstead to Opwijk | 207.90 mi (334.58 km) |
| Hemel Hempstead to Ostend | 150.24 mi (241.79 km) |
| Hemel Hempstead to Oud-Heverlee | 230.76 mi (371.37 km) |
| Hemel Hempstead to Oud-Turnhout | 236.21 mi (380.15 km) |
| Hemel Hempstead to Oudenaarde | 186.49 mi (300.12 km) |
| Hemel Hempstead to Oudenburg | 154.40 mi (248.48 km) |
| Hemel Hempstead to Oupeye | 274.02 mi (441.00 km) |
| Hemel Hempstead to Overijse | 226.34 mi (364.26 km) |
| Hemel Hempstead to Overpelt | 255.87 mi (411.78 km) |
| Hemel Hempstead to Paal | 248.10 mi (399.28 km) |
| Hemel Hempstead to Peer | 258.56 mi (416.12 km) |
| Hemel Hempstead to Pepinster | 284.33 mi (457.59 km) |
| Hemel Hempstead to Peruwelz | 195.31 mi (314.33 km) |
| Hemel Hempstead to Perwez | 241.69 mi (388.96 km) |
| Hemel Hempstead to Philippeville | 243.21 mi (391.41 km) |
