| Romeoville to Superior (Colorado) | 898.65 mi (1,446.23 km) |
| Romeoville to Superior (Wisconsin) | 401.50 mi (646.15 km) |
| Romeoville to Surprise (Arizona) | 1,434.60 mi (2,308.77 km) |
| Romeoville to Susanville (California) | 1,686.77 mi (2,714.59 km) |
| Romeoville to Sussex (Wisconsin) | 104.02 mi (167.41 km) |
| Romeoville to Suwanee (Georgia) | 567.92 mi (913.98 km) |
| Romeoville to Swansea (Illinois) | 235.05 mi (378.28 km) |
| Romeoville to Sweetwater (Florida) | 1,180.62 mi (1,900.02 km) |
| Romeoville to Sweetwater (Texas) | 926.41 mi (1,490.91 km) |
| Romeoville to Sycamore (Illinois) | 39.14 mi (62.98 km) |
| Romeoville to Sylacauga (Alabama) | 592.72 mi (953.88 km) |
| Romeoville to Sylvania (Ohio) | 226.64 mi (364.74 km) |
| Romeoville to Syosset (New York) | 759.79 mi (1,222.77 km) |
| Romeoville to Syracuse (New York) | 617.80 mi (994.26 km) |
| Romeoville to Syracuse (Utah) | 1,239.66 mi (1,995.05 km) |
