| Romeoville to Smyrna (Delaware) | 675.56 mi (1,087.21 km) |
| Romeoville to Smyrna (Georgia) | 571.18 mi (919.23 km) |
| Romeoville to Smyrna (Tennessee) | 400.33 mi (644.26 km) |
| Romeoville to Snellville (Georgia) | 581.79 mi (936.31 km) |
| Romeoville to Snoqualmie (Washington) | 1,695.32 mi (2,728.35 km) |
| Romeoville to Snyder (Texas) | 934.74 mi (1,504.32 km) |
| Romeoville to Socastee (South Carolina) | 739.79 mi (1,190.58 km) |
| Romeoville to Socorro (Texas) | 1,216.84 mi (1,958.32 km) |
| Romeoville to Soddy-Daisy (Tennessee) | 467.96 mi (753.11 km) |
| Romeoville to Solana Beach (California) | 1,699.84 mi (2,735.64 km) |
| Romeoville to Soledad (California) | 1,808.01 mi (2,909.71 km) |
| Romeoville to Solon (Ohio) | 344.91 mi (555.07 km) |
| Romeoville to Somers Point (New Jersey) | 726.18 mi (1,168.67 km) |
| Romeoville to Somerset (Kentucky) | 365.30 mi (587.89 km) |
| Romeoville to Somerset (New Jersey) | 711.84 mi (1,145.60 km) |
