| Boulder City to Sestu | 6,139.57 mi (9,880.68 km) |
| Boulder City to Settimo Torinese | 5,797.55 mi (9,330.25 km) |
| Boulder City to Seveso | 5,816.99 mi (9,361.55 km) |
| Boulder City to Sezze | 6,161.95 mi (9,916.71 km) |
| Boulder City to Siano | 6,252.80 mi (10,062.92 km) |
| Boulder City to Siena | 6,008.89 mi (9,670.37 km) |
| Boulder City to Signa | 5,977.03 mi (9,619.10 km) |
| Boulder City to Silea | 5,917.32 mi (9,523.01 km) |
| Boulder City to Silvi Paese | 6,140.06 mi (9,881.47 km) |
| Boulder City to Sinalunga | 6,027.41 mi (9,700.17 km) |
| Boulder City to Siniscola | 6,095.60 mi (9,809.93 km) |
| Boulder City to Sinnai | 6,143.40 mi (9,886.85 km) |
| Boulder City to Siracusa | 6,474.56 mi (10,419.80 km) |
| Boulder City to Solaro | 5,816.70 mi (9,361.07 km) |
| Boulder City to Soliera | 5,921.64 mi (9,529.95 km) |
