| Rockville to Somersworth (New Hampshire) | 434.92 mi (699.93 km) |
| Rockville to Somerton (Arizona) | 2,134.20 mi (3,434.66 km) |
| Rockville to Somerville (Massachusetts) | 390.57 mi (628.55 km) |
| Rockville to Somerville (New Jersey) | 169.68 mi (273.08 km) |
| Rockville to Sonoma (California) | 2,418.18 mi (3,891.69 km) |
| Rockville to Soquel (California) | 2,416.96 mi (3,889.72 km) |
| Rockville to South Bend (Indiana) | 511.76 mi (823.60 km) |
| Rockville to South Bradenton (Florida) | 861.58 mi (1,386.58 km) |
| Rockville to South Burlington (Vermont) | 423.23 mi (681.12 km) |
| Rockville to South Charleston (West Virginia) | 251.09 mi (404.10 km) |
| Rockville to South Daytona (Florida) | 719.56 mi (1,158.02 km) |
| Rockville to South El Monte (California) | 2,276.44 mi (3,663.58 km) |
| Rockville to South Elgin (Illinois) | 618.83 mi (995.91 km) |
| Rockville to South Euclid (Ohio) | 285.31 mi (459.16 km) |
| Rockville to South Farmingdale (New York) | 226.64 mi (364.74 km) |
