| Harrow to Sestu | 962.40 mi (1,548.83 km) |
| Harrow to Settimo Torinese | 580.11 mi (933.60 km) |
| Harrow to Seveso | 595.88 mi (958.97 km) |
| Harrow to Sezze | 941.38 mi (1,515.01 km) |
| Harrow to Siano | 1,031.66 mi (1,660.29 km) |
| Harrow to Siena | 787.98 mi (1,268.13 km) |
| Harrow to Signa | 755.92 mi (1,216.53 km) |
| Harrow to Silea | 706.45 mi (1,136.93 km) |
| Harrow to Silvi Paese | 920.48 mi (1,481.37 km) |
| Harrow to Sinalunga | 806.30 mi (1,297.62 km) |
| Harrow to Siniscola | 898.31 mi (1,445.69 km) |
| Harrow to Sinnai | 964.73 mi (1,552.58 km) |
| Harrow to Siracusa | 1,260.41 mi (2,028.44 km) |
| Harrow to Solaro | 595.56 mi (958.45 km) |
| Harrow to Soliera | 701.10 mi (1,128.30 km) |
