| Romeoville to Jeffersontown (Kentucky) | 272.05 mi (437.83 km) |
| Romeoville to Jeffersonville (Indiana) | 260.57 mi (419.34 km) |
| Romeoville to Jenison (Michigan) | 145.79 mi (234.63 km) |
| Romeoville to Jenks (Oklahoma) | 575.04 mi (925.43 km) |
| Romeoville to Jennings (Missouri) | 231.17 mi (372.03 km) |
| Romeoville to Jensen Beach (Florida) | 1,089.08 mi (1,752.71 km) |
| Romeoville to Jericho (New York) | 758.06 mi (1,219.97 km) |
| Romeoville to Jerome (Idaho) | 1,349.20 mi (2,171.33 km) |
| Romeoville to Jersey City (New Jersey) | 731.62 mi (1,177.43 km) |
| Romeoville to Jessup (Maryland) | 619.52 mi (997.01 km) |
| Romeoville to Johns Creek (Georgia) | 566.27 mi (911.32 km) |
| Romeoville to Johnson City (New York) | 624.80 mi (1,005.52 km) |
| Romeoville to Johnson City (Tennessee) | 477.25 mi (768.06 km) |
| Romeoville to Johnston (Iowa) | 290.27 mi (467.14 km) |
| Romeoville to Johnstown (Colorado) | 881.72 mi (1,419.00 km) |
