| Gaithersburg to Sestu | 4,421.70 mi (7,116.03 km) |
| Gaithersburg to Settimo Torinese | 4,167.47 mi (6,706.90 km) |
| Gaithersburg to Seveso | 4,210.26 mi (6,775.76 km) |
| Gaithersburg to Sezze | 4,522.66 mi (7,278.52 km) |
| Gaithersburg to Siano | 4,620.01 mi (7,435.18 km) |
| Gaithersburg to Siena | 4,382.41 mi (7,052.80 km) |
| Gaithersburg to Signa | 4,356.41 mi (7,010.97 km) |
| Gaithersburg to Silea | 4,343.97 mi (6,990.94 km) |
| Gaithersburg to Silvi Paese | 4,530.63 mi (7,291.34 km) |
| Gaithersburg to Sinalunga | 4,403.43 mi (7,086.63 km) |
| Gaithersburg to Siniscola | 4,404.73 mi (7,088.72 km) |
| Gaithersburg to Sinnai | 4,426.71 mi (7,124.10 km) |
| Gaithersburg to Siracusa | 4,788.32 mi (7,706.06 km) |
| Gaithersburg to Solaro | 4,208.88 mi (6,773.55 km) |
| Gaithersburg to Soliera | 4,316.55 mi (6,946.81 km) |
