| Rockville to Superior (Colorado) | 1,487.82 mi (2,394.42 km) |
| Rockville to Superior (Wisconsin) | 918.15 mi (1,477.63 km) |
| Rockville to Surprise (Arizona) | 1,985.65 mi (3,195.59 km) |
| Rockville to Susanville (California) | 2,286.85 mi (3,680.34 km) |
| Rockville to Sussex (Wisconsin) | 639.84 mi (1,029.73 km) |
| Rockville to Suwanee (Georgia) | 517.47 mi (832.78 km) |
| Rockville to Swansea (Illinois) | 691.12 mi (1,112.26 km) |
| Rockville to Sweetwater (Florida) | 938.08 mi (1,509.70 km) |
| Rockville to Sweetwater (Texas) | 1,376.63 mi (2,215.48 km) |
| Rockville to Sycamore (Illinois) | 637.21 mi (1,025.50 km) |
| Rockville to Sylacauga (Alabama) | 651.06 mi (1,047.78 km) |
| Rockville to Sylvania (Ohio) | 389.55 mi (626.91 km) |
| Rockville to Syosset (New York) | 227.50 mi (366.13 km) |
| Rockville to Syracuse (New York) | 278.45 mi (448.12 km) |
| Rockville to Syracuse (Utah) | 1,838.52 mi (2,958.81 km) |
