| Gaithersburg to Smyrna (Delaware) | 86.61 mi (139.38 km) |
| Gaithersburg to Smyrna (Georgia) | 544.82 mi (876.80 km) |
| Gaithersburg to Smyrna (Tennessee) | 554.72 mi (892.73 km) |
| Gaithersburg to Snellville (Georgia) | 524.36 mi (843.87 km) |
| Gaithersburg to Snoqualmie (Washington) | 2,282.90 mi (3,673.97 km) |
| Gaithersburg to Snyder (Texas) | 1,393.40 mi (2,242.47 km) |
| Gaithersburg to Socastee (South Carolina) | 389.38 mi (626.64 km) |
| Gaithersburg to Socorro (Texas) | 1,707.71 mi (2,748.29 km) |
| Gaithersburg to Soddy-Daisy (Tennessee) | 513.26 mi (826.01 km) |
| Gaithersburg to Solana Beach (California) | 2,257.71 mi (3,633.43 km) |
| Gaithersburg to Soledad (California) | 2,393.05 mi (3,851.24 km) |
| Gaithersburg to Solon (Ohio) | 271.75 mi (437.34 km) |
| Gaithersburg to Somers Point (New Jersey) | 140.07 mi (225.42 km) |
| Gaithersburg to Somerset (Kentucky) | 426.27 mi (686.01 km) |
| Gaithersburg to Somerset (New Jersey) | 172.39 mi (277.43 km) |
