| Rockford to Silver Firs (Washington) | 1,646.87 mi (2,650.38 km) |
| Rockford to Silver Spring (Maryland) | 669.67 mi (1,077.74 km) |
| Rockford to Silver Springs Shores (Florida) | 989.85 mi (1,593.01 km) |
| Rockford to Silverdale (Washington) | 1,671.43 mi (2,689.91 km) |
| Rockford to Silverton (Oregon) | 1,684.48 mi (2,710.91 km) |
| Rockford to Simi Valley (California) | 1,692.29 mi (2,723.48 km) |
| Rockford to Simpsonville (South Carolina) | 636.89 mi (1,024.97 km) |
| Rockford to Sioux City (Iowa) | 374.17 mi (602.16 km) |
| Rockford to Sioux Falls (South Dakota) | 397.85 mi (640.29 km) |
| Rockford to Skokie (Illinois) | 69.56 mi (111.95 km) |
| Rockford to Sleepy Hollow (New York) | 787.06 mi (1,266.66 km) |
| Rockford to Slidell (Louisiana) | 828.07 mi (1,332.65 km) |
| Rockford to Smithfield (North Carolina) | 740.14 mi (1,191.15 km) |
| Rockford to Smithfield (Utah) | 1,164.79 mi (1,874.55 km) |
| Rockford to Smithville (Missouri) | 349.55 mi (562.55 km) |
