| Gaithersburg to Security-Widefield (Colorado) | 1,472.46 mi (2,369.69 km) |
| Gaithersburg to Sedalia (Missouri) | 860.61 mi (1,385.02 km) |
| Gaithersburg to Sedro-Woolley (Washington) | 2,299.33 mi (3,700.41 km) |
| Gaithersburg to Seguin (Texas) | 1,350.38 mi (2,173.22 km) |
| Gaithersburg to Selden (New York) | 251.01 mi (403.97 km) |
| Gaithersburg to Selma (Alabama) | 719.28 mi (1,157.57 km) |
| Gaithersburg to Selma (California) | 2,298.97 mi (3,699.83 km) |
| Gaithersburg to Selma (Texas) | 1,367.57 mi (2,200.89 km) |
| Gaithersburg to Seminole (Florida) | 843.13 mi (1,356.89 km) |
| Gaithersburg to Seven Hills (Ohio) | 281.71 mi (453.36 km) |
| Gaithersburg to Seven Oaks (South Carolina) | 413.51 mi (665.49 km) |
| Gaithersburg to Severn (Maryland) | 27.73 mi (44.63 km) |
| Gaithersburg to Severna Park (Maryland) | 34.70 mi (55.85 km) |
| Gaithersburg to Sevierville (Tennessee) | 414.14 mi (666.49 km) |
| Gaithersburg to Seymour (Indiana) | 465.70 mi (749.47 km) |
