| Boulder to Spello | 5,517.23 mi (8,879.13 km) |
| Boulder to Spilamberto | 5,383.10 mi (8,663.26 km) |
| Boulder to Spilimbergo | 5,367.29 mi (8,637.82 km) |
| Boulder to Spinea | 5,374.72 mi (8,649.77 km) |
| Boulder to Spoleto | 5,529.36 mi (8,898.65 km) |
| Boulder to Spoltore | 5,595.00 mi (9,004.28 km) |
| Boulder to Spresiano | 5,363.31 mi (8,631.42 km) |
| Boulder to Squinzano | 5,833.50 mi (9,388.12 km) |
| Boulder to Statte | 5,797.60 mi (9,330.34 km) |
| Boulder to Stezzano | 5,281.47 mi (8,499.71 km) |
| Boulder to Strada | 5,440.38 mi (8,755.45 km) |
| Boulder to Stradella | 5,296.63 mi (8,524.11 km) |
| Boulder to Striano | 5,693.56 mi (9,162.90 km) |
| Boulder to Subiaco | 5,585.31 mi (8,988.68 km) |
| Boulder to Sulmona | 5,608.33 mi (9,025.73 km) |
