| Hemel Hempstead to Opole | 797.93 mi (1,284.15 km) |
| Hemel Hempstead to Orzesze | 841.36 mi (1,354.03 km) |
| Hemel Hempstead to Osowa | 804.67 mi (1,294.99 km) |
| Hemel Hempstead to Ostroda | 862.55 mi (1,388.15 km) |
| Hemel Hempstead to Ostroleka | 929.48 mi (1,495.85 km) |
| Hemel Hempstead to Ostrow Mazowiecka | 944.58 mi (1,520.16 km) |
| Hemel Hempstead to Ostrow Wielkopolski | 781.00 mi (1,256.90 km) |
| Hemel Hempstead to Ostrowiec Swietokrzyski | 942.01 mi (1,516.02 km) |
| Hemel Hempstead to Ostrzeszow | 788.29 mi (1,268.64 km) |
| Hemel Hempstead to Oswiecim | 863.55 mi (1,389.74 km) |
| Hemel Hempstead to Otwock | 922.83 mi (1,485.15 km) |
| Hemel Hempstead to Ozarow Mazowiecki | 902.38 mi (1,452.24 km) |
| Hemel Hempstead to Ozimek | 809.80 mi (1,303.25 km) |
| Hemel Hempstead to Ozorkow | 840.40 mi (1,352.50 km) |
| Hemel Hempstead to Pabianice | 847.51 mi (1,363.94 km) |
