| Rockford to Superior (Colorado) | 851.94 mi (1,371.07 km) |
| Rockford to Superior (Wisconsin) | 340.55 mi (548.06 km) |
| Rockford to Surprise (Arizona) | 1,398.87 mi (2,251.27 km) |
| Rockford to Susanville (California) | 1,632.18 mi (2,626.75 km) |
| Rockford to Sussex (Wisconsin) | 74.03 mi (119.14 km) |
| Rockford to Suwanee (Georgia) | 628.46 mi (1,011.42 km) |
| Rockford to Swansea (Illinois) | 260.80 mi (419.72 km) |
| Rockford to Sweetwater (Florida) | 1,240.99 mi (1,997.18 km) |
| Rockford to Sweetwater (Texas) | 917.97 mi (1,477.33 km) |
| Rockford to Sycamore (Illinois) | 26.75 mi (43.05 km) |
| Rockford to Sylacauga (Alabama) | 645.81 mi (1,039.33 km) |
| Rockford to Sylvania (Ohio) | 277.58 mi (446.72 km) |
| Rockford to Syosset (New York) | 809.84 mi (1,303.31 km) |
| Rockford to Syracuse (New York) | 658.15 mi (1,059.19 km) |
| Rockford to Syracuse (Utah) | 1,186.47 mi (1,909.44 km) |
