| Boulder to Solofra | 5,702.62 mi (9,177.48 km) |
| Boulder to Somma Lombardo | 5,246.88 mi (8,444.04 km) |
| Boulder to Somma Vesuviana | 5,686.15 mi (9,150.98 km) |
| Boulder to Sommacampagna | 5,334.81 mi (8,585.55 km) |
| Boulder to Sona | 5,332.61 mi (8,582.01 km) |
| Boulder to Sondrio | 5,263.84 mi (8,471.33 km) |
| Boulder to Sora | 5,614.38 mi (9,035.47 km) |
| Boulder to Sorbolo | 5,348.09 mi (8,606.92 km) |
| Boulder to Soresina | 5,306.17 mi (8,539.46 km) |
| Boulder to Sorisole | 5,277.41 mi (8,493.17 km) |
| Boulder to Sorrento | 5,696.46 mi (9,167.56 km) |
| Boulder to Sorso | 5,477.73 mi (8,815.56 km) |
| Boulder to Sortino | 5,898.23 mi (9,492.28 km) |
| Boulder to Soverato Marina | 5,873.78 mi (9,452.94 km) |
| Boulder to Sovicille | 5,452.30 mi (8,774.62 km) |
