| Towcester to Imola | 791.97 mi (1,274.55 km) |
| Towcester to Impruneta | 811.53 mi (1,306.04 km) |
| Towcester to Induno Olona | 620.78 mi (999.05 km) |
| Towcester to Inverigo | 639.18 mi (1,028.66 km) |
| Towcester to Inveruno | 638.58 mi (1,027.69 km) |
| Towcester to Inzago | 658.07 mi (1,059.06 km) |
| Towcester to Iseo | 670.69 mi (1,079.37 km) |
| Towcester to Isernia | 1,019.11 mi (1,640.09 km) |
| Towcester to Isola Capo Rizzuto | 1,255.75 mi (2,020.93 km) |
| Towcester to Isola del Liri | 993.37 mi (1,598.68 km) |
| Towcester to Isola della Scala | 722.38 mi (1,162.56 km) |
| Towcester to Isola Vicentina | 720.12 mi (1,158.93 km) |
| Towcester to Ispica | 1,312.32 mi (2,111.98 km) |
| Towcester to Istrana | 741.00 mi (1,192.52 km) |
| Towcester to Itri | 1,013.70 mi (1,631.40 km) |
