| Romeoville to St. George (Utah) | 1,391.49 mi (2,239.38 km) |
| Romeoville to St. Helens (Oregon) | 1,743.14 mi (2,805.31 km) |
| Romeoville to St. James (New York) | 777.21 mi (1,250.81 km) |
| Romeoville to St. John (Indiana) | 35.10 mi (56.49 km) |
| Romeoville to St. Joseph (Missouri) | 374.97 mi (603.46 km) |
| Romeoville to St. Louis (Missouri) | 235.97 mi (379.76 km) |
| Romeoville to St. Louis Park (Minnesota) | 350.07 mi (563.38 km) |
| Romeoville to St. Marys (Georgia) | 834.26 mi (1,342.61 km) |
| Romeoville to St. Marys (Pennsylvania) | 494.55 mi (795.89 km) |
| Romeoville to St. Matthews (Kentucky) | 267.56 mi (430.60 km) |
| Romeoville to St. Michael (Minnesota) | 373.47 mi (601.04 km) |
| Romeoville to St. Paul (Minnesota) | 340.22 mi (547.53 km) |
| Romeoville to St. Peter (Minnesota) | 350.10 mi (563.43 km) |
| Romeoville to St. Peters (Missouri) | 237.14 mi (381.64 km) |
| Romeoville to St. Petersburg (Florida) | 1,004.17 mi (1,616.06 km) |
