| Thornton to Imola | 892.68 mi (1,436.62 km) |
| Thornton to Impruneta | 915.74 mi (1,473.73 km) |
| Thornton to Induno Olona | 724.91 mi (1,166.63 km) |
| Thornton to Inverigo | 742.51 mi (1,194.95 km) |
| Thornton to Inveruno | 743.91 mi (1,197.21 km) |
| Thornton to Inzago | 761.31 mi (1,225.21 km) |
| Thornton to Iseo | 771.56 mi (1,241.70 km) |
| Thornton to Isernia | 1,121.21 mi (1,804.42 km) |
| Thornton to Isola Capo Rizzuto | 1,357.27 mi (2,184.32 km) |
| Thornton to Isola del Liri | 1,096.93 mi (1,765.33 km) |
| Thornton to Isola della Scala | 821.76 mi (1,322.50 km) |
| Thornton to Isola Vicentina | 816.52 mi (1,314.06 km) |
| Thornton to Ispica | 1,421.78 mi (2,288.14 km) |
| Thornton to Istrana | 835.06 mi (1,343.90 km) |
| Thornton to Itri | 1,118.28 mi (1,799.70 km) |
