| Rock Island to Somersworth (New Hampshire) | 1,010.74 mi (1,626.63 km) |
| Rock Island to Somerton (Arizona) | 1,457.97 mi (2,346.37 km) |
| Rock Island to Somerville (Massachusetts) | 1,001.21 mi (1,611.29 km) |
| Rock Island to Somerville (New Jersey) | 833.82 mi (1,341.91 km) |
| Rock Island to Sonoma (California) | 1,694.68 mi (2,727.33 km) |
| Rock Island to Soquel (California) | 1,697.17 mi (2,731.33 km) |
| Rock Island to South Bend (Indiana) | 223.37 mi (359.49 km) |
| Rock Island to South Bradenton (Florida) | 1,068.61 mi (1,719.77 km) |
| Rock Island to South Burlington (Vermont) | 899.98 mi (1,448.38 km) |
| Rock Island to South Charleston (West Virginia) | 516.92 mi (831.91 km) |
| Rock Island to South Daytona (Florida) | 1,005.60 mi (1,618.35 km) |
| Rock Island to South El Monte (California) | 1,577.52 mi (2,538.78 km) |
| Rock Island to South Elgin (Illinois) | 122.41 mi (197.00 km) |
| Rock Island to South Euclid (Ohio) | 468.56 mi (754.08 km) |
| Rock Island to South Farmingdale (New York) | 892.31 mi (1,436.04 km) |
