| Rockford to Jeffersontown (Kentucky) | 335.26 mi (539.55 km) |
| Rockford to Jeffersonville (Indiana) | 323.68 mi (520.91 km) |
| Rockford to Jenison (Michigan) | 170.62 mi (274.59 km) |
| Rockford to Jenks (Oklahoma) | 569.07 mi (915.83 km) |
| Rockford to Jennings (Missouri) | 252.35 mi (406.12 km) |
| Rockford to Jensen Beach (Florida) | 1,150.44 mi (1,851.46 km) |
| Rockford to Jericho (New York) | 808.23 mi (1,300.71 km) |
| Rockford to Jerome (Idaho) | 1,292.24 mi (2,079.66 km) |
| Rockford to Jersey City (New Jersey) | 782.34 mi (1,259.05 km) |
| Rockford to Jessup (Maryland) | 677.77 mi (1,090.76 km) |
| Rockford to Johns Creek (Georgia) | 626.48 mi (1,008.22 km) |
| Rockford to Johnson City (New York) | 670.10 mi (1,078.42 km) |
| Rockford to Johnson City (Tennessee) | 542.72 mi (873.42 km) |
| Rockford to Johnston (Iowa) | 242.51 mi (390.28 km) |
| Rockford to Johnstown (Colorado) | 833.67 mi (1,341.67 km) |
