| Rockford to San Luis Obispo (California) | 1,758.65 mi (2,830.27 km) |
| Rockford to San Marcos (California) | 1,651.46 mi (2,657.76 km) |
| Rockford to San Marcos (Texas) | 987.55 mi (1,589.30 km) |
| Rockford to San Marino (California) | 1,664.92 mi (2,679.43 km) |
| Rockford to San Mateo (California) | 1,780.25 mi (2,865.04 km) |
| Rockford to San Pablo (California) | 1,771.82 mi (2,851.46 km) |
| Rockford to San Rafael (California) | 1,780.33 mi (2,865.17 km) |
| Rockford to San Ramon (California) | 1,755.89 mi (2,825.83 km) |
| Rockford to San Tan Valley (Arizona) | 1,374.61 mi (2,212.21 km) |
| Rockford to Sand Springs (Oklahoma) | 567.15 mi (912.73 km) |
| Rockford to Sandusky (Ohio) | 332.10 mi (534.46 km) |
| Rockford to Sandy (Oregon) | 1,657.31 mi (2,667.18 km) |
| Rockford to Sandy (Utah) | 1,182.89 mi (1,903.68 km) |
| Rockford to Sandy Springs (Georgia) | 628.88 mi (1,012.09 km) |
| Rockford to Sanford (Florida) | 1,027.48 mi (1,653.56 km) |
