| Rock Island to Smyrna (Delaware) | 801.27 mi (1,289.51 km) |
| Rock Island to Smyrna (Georgia) | 621.12 mi (999.60 km) |
| Rock Island to Smyrna (Tennessee) | 438.38 mi (705.50 km) |
| Rock Island to Snellville (Georgia) | 636.89 mi (1,024.98 km) |
| Rock Island to Snoqualmie (Washington) | 1,584.44 mi (2,549.92 km) |
| Rock Island to Snyder (Texas) | 829.51 mi (1,334.96 km) |
| Rock Island to Socastee (South Carolina) | 829.82 mi (1,335.47 km) |
| Rock Island to Socorro (Texas) | 1,100.89 mi (1,771.71 km) |
| Rock Island to Soddy-Daisy (Tennessee) | 519.48 mi (836.03 km) |
| Rock Island to Solana Beach (California) | 1,571.97 mi (2,529.84 km) |
| Rock Island to Soledad (California) | 1,679.44 mi (2,702.79 km) |
| Rock Island to Solon (Ohio) | 473.45 mi (761.95 km) |
| Rock Island to Somers Point (New Jersey) | 852.48 mi (1,371.93 km) |
| Rock Island to Somerset (Kentucky) | 440.10 mi (708.27 km) |
| Rock Island to Somerset (New Jersey) | 840.13 mi (1,352.07 km) |
