| Rockford to Somersworth (New Hampshire) | 922.94 mi (1,485.33 km) |
| Rockford to Somerton (Arizona) | 1,548.69 mi (2,492.37 km) |
| Rockford to Somerville (Massachusetts) | 915.92 mi (1,474.03 km) |
| Rockford to Somerville (New Jersey) | 757.09 mi (1,218.41 km) |
| Rockford to Sonoma (California) | 1,770.11 mi (2,848.71 km) |
| Rockford to Soquel (California) | 1,775.72 mi (2,857.74 km) |
| Rockford to South Bend (Indiana) | 149.09 mi (239.93 km) |
| Rockford to South Bradenton (Florida) | 1,085.63 mi (1,747.15 km) |
| Rockford to South Burlington (Vermont) | 808.96 mi (1,301.89 km) |
| Rockford to South Charleston (West Virginia) | 472.14 mi (759.84 km) |
| Rockford to South Daytona (Florida) | 1,010.19 mi (1,625.74 km) |
| Rockford to South El Monte (California) | 1,664.06 mi (2,678.05 km) |
| Rockford to South Elgin (Illinois) | 42.71 mi (68.74 km) |
| Rockford to South Euclid (Ohio) | 390.97 mi (629.20 km) |
| Rockford to South Farmingdale (New York) | 814.09 mi (1,310.15 km) |
