| Rockford to Isabela (Puerto Rico) | 2,089.27 mi (3,362.35 km) |
| Rockford to Iselin (New Jersey) | 771.98 mi (1,242.39 km) |
| Rockford to Isla Vista (California) | 1,743.87 mi (2,806.48 km) |
| Rockford to Issaquah (Washington) | 1,641.75 mi (2,642.14 km) |
| Rockford to Ithaca (New York) | 640.91 mi (1,031.45 km) |
| Rockford to Ives Estates (Florida) | 1,233.53 mi (1,985.18 km) |
| Rockford to Jackson (Michigan) | 238.31 mi (383.52 km) |
| Rockford to Jackson (Mississippi) | 689.93 mi (1,110.34 km) |
| Rockford to Jackson (Missouri) | 338.64 mi (544.99 km) |
| Rockford to Jackson (Tennessee) | 456.58 mi (734.80 km) |
| Rockford to Jackson (Wyoming) | 1,099.52 mi (1,769.51 km) |
| Rockford to Jacksonville (Alabama) | 610.90 mi (983.15 km) |
| Rockford to Jacksonville (Arkansas) | 535.96 mi (862.55 km) |
| Rockford to Jacksonville (Florida) | 920.20 mi (1,480.92 km) |
| Rockford to Jacksonville (Illinois) | 185.13 mi (297.94 km) |
