| Rock Island to Johnstown (Pennsylvania) | 613.75 mi (987.74 km) |
| Rock Island to Joliet (Illinois) | 125.94 mi (202.69 km) |
| Rock Island to Jonesboro (Arkansas) | 390.32 mi (628.16 km) |
| Rock Island to Joplin (Missouri) | 368.85 mi (593.61 km) |
| Rock Island to Joppatowne (Maryland) | 760.70 mi (1,224.23 km) |
| Rock Island to Juana Díaz (Puerto Rico) | 2,153.52 mi (3,465.76 km) |
| Rock Island to Junction City (Kansas) | 371.00 mi (597.06 km) |
| Rock Island to Juneau (Alaska) | 2,209.14 mi (3,555.27 km) |
| Rock Island to Jupiter (Florida) | 1,167.79 mi (1,879.37 km) |
| Rock Island to Jupiter Farms (Florida) | 1,164.60 mi (1,874.25 km) |
| Rock Island to Jurupa Valley (California) | 1,549.62 mi (2,493.87 km) |
| Rock Island to Justice (Illinois) | 143.27 mi (230.58 km) |
| Rock Island to Kahului (Hawaii) | 4,043.95 mi (6,508.10 km) |
| Rock Island to Kailua (Hawaii) | 4,088.72 mi (6,580.16 km) |
| Rock Island to Kalamazoo (Michigan) | 262.87 mi (423.05 km) |
