| Port Huron to Imola | 4,420.42 mi (7,113.98 km) |
| Port Huron to Impruneta | 4,428.70 mi (7,127.31 km) |
| Port Huron to Induno Olona | 4,246.03 mi (6,833.33 km) |
| Port Huron to Inverigo | 4,265.87 mi (6,865.26 km) |
| Port Huron to Inveruno | 4,259.49 mi (6,854.98 km) |
| Port Huron to Inzago | 4,284.28 mi (6,894.88 km) |
| Port Huron to Iseo | 4,302.21 mi (6,923.73 km) |
| Port Huron to Isernia | 4,636.48 mi (7,461.69 km) |
| Port Huron to Isola Capo Rizzuto | 4,868.40 mi (7,834.93 km) |
| Port Huron to Isola del Liri | 4,606.01 mi (7,412.66 km) |
| Port Huron to Isola della Scala | 4,355.66 mi (7,009.75 km) |
| Port Huron to Isola Vicentina | 4,358.65 mi (7,014.58 km) |
| Port Huron to Ispica | 4,872.81 mi (7,842.03 km) |
| Port Huron to Istrana | 4,382.31 mi (7,052.64 km) |
| Port Huron to Itri | 4,621.11 mi (7,436.96 km) |
