| Dumbarton to Imola | 1,072.43 mi (1,725.91 km) |
| Dumbarton to Impruneta | 1,097.18 mi (1,765.73 km) |
| Dumbarton to Induno Olona | 906.70 mi (1,459.19 km) |
| Dumbarton to Inverigo | 923.91 mi (1,486.88 km) |
| Dumbarton to Inveruno | 926.14 mi (1,490.48 km) |
| Dumbarton to Inzago | 942.62 mi (1,517.00 km) |
| Dumbarton to Iseo | 951.73 mi (1,531.66 km) |
| Dumbarton to Isernia | 1,301.28 mi (2,094.21 km) |
| Dumbarton to Isola Capo Rizzuto | 1,536.69 mi (2,473.07 km) |
| Dumbarton to Isola del Liri | 1,277.79 mi (2,056.40 km) |
| Dumbarton to Isola della Scala | 1,001.01 mi (1,610.98 km) |
| Dumbarton to Isola Vicentina | 994.12 mi (1,599.89 km) |
| Dumbarton to Ispica | 1,605.00 mi (2,583.00 km) |
| Dumbarton to Istrana | 1,011.17 mi (1,627.33 km) |
| Dumbarton to Itri | 1,299.63 mi (2,091.55 km) |
