| Harpenden to Sierpc | 845.33 mi (1,360.42 km) |
| Harpenden to Skarzysko-Kamienna | 913.50 mi (1,470.14 km) |
| Harpenden to Skawina | 885.75 mi (1,425.47 km) |
| Harpenden to Skierniewice | 871.39 mi (1,402.37 km) |
| Harpenden to Skoczow | 844.69 mi (1,359.39 km) |
| Harpenden to Skwierzyna | 671.99 mi (1,081.46 km) |
| Harpenden to Slawno | 726.09 mi (1,168.53 km) |
| Harpenden to Slubice | 633.38 mi (1,019.33 km) |
| Harpenden to Slupca | 772.66 mi (1,243.48 km) |
| Harpenden to Slupsk | 741.14 mi (1,192.75 km) |
| Harpenden to Sochaczew | 872.70 mi (1,404.48 km) |
| Harpenden to Sokolka | 1,001.98 mi (1,612.54 km) |
| Harpenden to Sokolow Podlaski | 956.06 mi (1,538.62 km) |
| Harpenden to Solec Kujawski | 785.25 mi (1,263.73 km) |
| Harpenden to Sopot | 802.41 mi (1,291.35 km) |
