| Prospect Heights to Isabela (Puerto Rico) | 2,040.99 mi (3,284.65 km) |
| Prospect Heights to Iselin (New Jersey) | 713.16 mi (1,147.72 km) |
| Prospect Heights to Isla Vista (California) | 1,800.29 mi (2,897.28 km) |
| Prospect Heights to Issaquah (Washington) | 1,699.23 mi (2,734.65 km) |
| Prospect Heights to Ithaca (New York) | 584.05 mi (939.94 km) |
| Prospect Heights to Ives Estates (Florida) | 1,198.80 mi (1,929.28 km) |
| Prospect Heights to Jackson (Michigan) | 180.64 mi (290.71 km) |
| Prospect Heights to Jackson (Mississippi) | 687.82 mi (1,106.94 km) |
| Prospect Heights to Jackson (Missouri) | 339.05 mi (545.65 km) |
| Prospect Heights to Jackson (Tennessee) | 448.32 mi (721.51 km) |
| Prospect Heights to Jackson (Wyoming) | 1,158.71 mi (1,864.77 km) |
| Prospect Heights to Jacksonville (Alabama) | 585.17 mi (941.73 km) |
| Prospect Heights to Jacksonville (Arkansas) | 548.22 mi (882.28 km) |
| Prospect Heights to Jacksonville (Florida) | 884.20 mi (1,422.99 km) |
| Prospect Heights to Jacksonville (Illinois) | 203.46 mi (327.44 km) |
