| Hertford to Sestu | 969.02 mi (1,559.48 km) |
| Hertford to Settimo Torinese | 583.34 mi (938.80 km) |
| Hertford to Seveso | 596.77 mi (960.42 km) |
| Hertford to Sezze | 943.04 mi (1,517.67 km) |
| Hertford to Siano | 1,032.60 mi (1,661.80 km) |
| Hertford to Siena | 789.47 mi (1,270.53 km) |
| Hertford to Signa | 757.13 mi (1,218.49 km) |
| Hertford to Silea | 704.26 mi (1,133.40 km) |
| Hertford to Silvi Paese | 920.36 mi (1,481.17 km) |
| Hertford to Sinalunga | 807.53 mi (1,299.60 km) |
| Hertford to Siniscola | 903.63 mi (1,454.25 km) |
| Hertford to Sinnai | 971.25 mi (1,563.07 km) |
| Hertford to Siracusa | 1,263.36 mi (2,033.18 km) |
| Hertford to Solaro | 596.55 mi (960.06 km) |
| Hertford to Soliera | 701.36 mi (1,128.73 km) |
