| Romeoville to Silver Firs (Washington) | 1,710.31 mi (2,752.47 km) |
| Romeoville to Silver Spring (Maryland) | 610.76 mi (982.92 km) |
| Romeoville to Silver Springs Shores (Florida) | 929.79 mi (1,496.36 km) |
| Romeoville to Silverdale (Washington) | 1,734.72 mi (2,791.76 km) |
| Romeoville to Silverton (Oregon) | 1,745.35 mi (2,808.88 km) |
| Romeoville to Simi Valley (California) | 1,735.27 mi (2,792.65 km) |
| Romeoville to Simpsonville (South Carolina) | 572.55 mi (921.42 km) |
| Romeoville to Sioux City (Iowa) | 429.25 mi (690.80 km) |
| Romeoville to Sioux Falls (South Dakota) | 458.20 mi (737.40 km) |
| Romeoville to Skokie (Illinois) | 33.51 mi (53.93 km) |
| Romeoville to Sleepy Hollow (New York) | 737.90 mi (1,187.53 km) |
| Romeoville to Slidell (Louisiana) | 789.32 mi (1,270.28 km) |
| Romeoville to Smithfield (North Carolina) | 674.60 mi (1,085.67 km) |
| Romeoville to Smithfield (Utah) | 1,219.55 mi (1,962.67 km) |
| Romeoville to Smithville (Missouri) | 373.55 mi (601.17 km) |
