| Rockford to Southern Pines (North Carolina) | 712.94 mi (1,147.37 km) |
| Rockford to Southfield (Michigan) | 296.58 mi (477.30 km) |
| Rockford to Southgate (Michigan) | 299.67 mi (482.27 km) |
| Rockford to Southlake (Texas) | 779.70 mi (1,254.81 km) |
| Rockford to Spanaway (Washington) | 1,659.40 mi (2,670.55 km) |
| Rockford to Spanish Fork (Utah) | 1,179.79 mi (1,898.69 km) |
| Rockford to Spanish Lake (Missouri) | 247.24 mi (397.89 km) |
| Rockford to Spanish Springs (Nevada) | 1,598.36 mi (2,572.31 km) |
| Rockford to Sparks (Nevada) | 1,602.38 mi (2,578.78 km) |
| Rockford to Spartanburg (South Carolina) | 635.14 mi (1,022.16 km) |
| Rockford to Spearfish (South Dakota) | 755.60 mi (1,216.03 km) |
| Rockford to Speedway (Indiana) | 224.85 mi (361.87 km) |
| Rockford to Spencer (Iowa) | 315.13 mi (507.15 km) |
| Rockford to Spokane (Washington) | 1,427.44 mi (2,297.24 km) |
| Rockford to Spokane Valley (Washington) | 1,418.21 mi (2,282.40 km) |
