| Romeoville to Somersworth (New Hampshire) | 883.23 mi (1,421.42 km) |
| Romeoville to Somerton (Arizona) | 1,584.56 mi (2,550.10 km) |
| Romeoville to Somerville (Massachusetts) | 872.76 mi (1,404.57 km) |
| Romeoville to Somerville (New Jersey) | 705.48 mi (1,135.37 km) |
| Romeoville to Sonoma (California) | 1,822.08 mi (2,932.36 km) |
| Romeoville to Soquel (California) | 1,825.44 mi (2,937.76 km) |
| Romeoville to South Bend (Indiana) | 94.53 mi (152.13 km) |
| Romeoville to South Bradenton (Florida) | 1,027.61 mi (1,653.77 km) |
| Romeoville to South Burlington (Vermont) | 775.12 mi (1,247.44 km) |
| Romeoville to South Charleston (West Virginia) | 407.09 mi (655.15 km) |
| Romeoville to South Daytona (Florida) | 948.61 mi (1,526.64 km) |
| Romeoville to South El Monte (California) | 1,706.07 mi (2,745.66 km) |
| Romeoville to South Elgin (Illinois) | 27.13 mi (43.65 km) |
| Romeoville to South Euclid (Ohio) | 339.84 mi (546.92 km) |
| Romeoville to South Farmingdale (New York) | 763.71 mi (1,229.08 km) |
