| Harpenden to Sestu | 976.30 mi (1,571.20 km) |
| Harpenden to Settimo Torinese | 592.21 mi (953.06 km) |
| Harpenden to Seveso | 606.55 mi (976.14 km) |
| Harpenden to Sezze | 952.56 mi (1,532.99 km) |
| Harpenden to Siano | 1,042.38 mi (1,677.55 km) |
| Harpenden to Siena | 799.04 mi (1,285.93 km) |
| Harpenden to Signa | 766.80 mi (1,234.05 km) |
| Harpenden to Silea | 715.00 mi (1,150.68 km) |
| Harpenden to Silvi Paese | 930.50 mi (1,497.49 km) |
| Harpenden to Sinalunga | 817.20 mi (1,315.16 km) |
| Harpenden to Siniscola | 911.57 mi (1,467.03 km) |
| Harpenden to Sinnai | 978.58 mi (1,574.87 km) |
| Harpenden to Siracusa | 1,272.38 mi (2,047.70 km) |
| Harpenden to Solaro | 606.29 mi (975.72 km) |
| Harpenden to Soliera | 711.36 mi (1,144.82 km) |
