| Gaithersburg to San Luis Obispo (California) | 2,383.66 mi (3,836.12 km) |
| Gaithersburg to San Marcos (California) | 2,249.56 mi (3,620.32 km) |
| Gaithersburg to San Marcos (Texas) | 1,337.68 mi (2,152.80 km) |
| Gaithersburg to San Marino (California) | 2,274.76 mi (3,660.87 km) |
| Gaithersburg to San Mateo (California) | 2,421.02 mi (3,896.25 km) |
| Gaithersburg to San Pablo (California) | 2,414.51 mi (3,885.78 km) |
| Gaithersburg to San Rafael (California) | 2,423.35 mi (3,900.01 km) |
| Gaithersburg to San Ramon (California) | 2,397.17 mi (3,857.87 km) |
| Gaithersburg to San Tan Valley (Arizona) | 1,947.74 mi (3,134.59 km) |
| Gaithersburg to Sand Springs (Oklahoma) | 1,053.46 mi (1,695.38 km) |
| Gaithersburg to Sandusky (Ohio) | 330.39 mi (531.70 km) |
| Gaithersburg to Sandy (Oregon) | 2,312.91 mi (3,722.27 km) |
| Gaithersburg to Sandy (Utah) | 1,828.09 mi (2,942.02 km) |
| Gaithersburg to Sandy Springs (Georgia) | 535.26 mi (861.42 km) |
| Gaithersburg to Sanford (Florida) | 751.53 mi (1,209.47 km) |
