| Romeoville to Johnstown (Pennsylvania) | 487.04 mi (783.81 km) |
| Romeoville to Joliet (Illinois) | 8.23 mi (13.24 km) |
| Romeoville to Jonesboro (Arkansas) | 424.81 mi (683.66 km) |
| Romeoville to Joplin (Missouri) | 464.60 mi (747.70 km) |
| Romeoville to Joppatowne (Maryland) | 635.12 mi (1,022.12 km) |
| Romeoville to Juana Díaz (Puerto Rico) | 2,068.00 mi (3,328.13 km) |
| Romeoville to Junction City (Kansas) | 494.52 mi (795.85 km) |
| Romeoville to Juneau (Alaska) | 2,289.00 mi (3,683.80 km) |
| Romeoville to Jupiter (Florida) | 1,112.80 mi (1,790.89 km) |
| Romeoville to Jupiter Farms (Florida) | 1,110.23 mi (1,786.74 km) |
| Romeoville to Jurupa Valley (California) | 1,678.06 mi (2,700.57 km) |
| Romeoville to Justice (Illinois) | 15.92 mi (25.62 km) |
| Romeoville to Kahului (Hawaii) | 4,171.94 mi (6,714.09 km) |
| Romeoville to Kailua (Hawaii) | 4,216.34 mi (6,785.54 km) |
| Romeoville to Kalamazoo (Michigan) | 136.48 mi (219.64 km) |
