| Rockford to Smyrna (Delaware) | 732.34 mi (1,178.59 km) |
| Rockford to Smyrna (Georgia) | 630.41 mi (1,014.55 km) |
| Rockford to Smyrna (Tennessee) | 455.39 mi (732.88 km) |
| Rockford to Snellville (Georgia) | 642.26 mi (1,033.62 km) |
| Rockford to Snoqualmie (Washington) | 1,632.13 mi (2,626.67 km) |
| Rockford to Snyder (Texas) | 923.96 mi (1,486.97 km) |
| Rockford to Socastee (South Carolina) | 805.54 mi (1,296.39 km) |
| Rockford to Socorro (Texas) | 1,196.12 mi (1,924.97 km) |
| Rockford to Soddy-Daisy (Tennessee) | 527.11 mi (848.31 km) |
| Rockford to Solana Beach (California) | 1,660.56 mi (2,672.41 km) |
| Rockford to Soledad (California) | 1,759.51 mi (2,831.65 km) |
| Rockford to Solon (Ohio) | 397.02 mi (638.94 km) |
| Rockford to Somers Point (New Jersey) | 782.07 mi (1,258.62 km) |
| Rockford to Somerset (Kentucky) | 428.79 mi (690.08 km) |
| Rockford to Somerset (New Jersey) | 763.61 mi (1,228.91 km) |
