| Potomac to Spello | 4,456.30 mi (7,171.72 km) |
| Potomac to Spilamberto | 4,331.56 mi (6,970.97 km) |
| Potomac to Spilimbergo | 4,356.99 mi (7,011.90 km) |
| Potomac to Spinea | 4,348.04 mi (6,997.50 km) |
| Potomac to Spoleto | 4,465.06 mi (7,185.82 km) |
| Potomac to Spoltore | 4,539.15 mi (7,305.05 km) |
| Potomac to Spresiano | 4,342.03 mi (6,987.82 km) |
| Potomac to Squinzano | 4,785.01 mi (7,700.73 km) |
| Potomac to Statte | 4,742.81 mi (7,632.82 km) |
| Potomac to Stezzano | 4,236.28 mi (6,817.64 km) |
| Potomac to Strada | 4,376.72 mi (7,043.65 km) |
| Potomac to Stradella | 4,239.47 mi (6,822.77 km) |
| Potomac to Striano | 4,617.75 mi (7,431.55 km) |
| Potomac to Subiaco | 4,512.47 mi (7,262.12 km) |
| Potomac to Sulmona | 4,544.55 mi (7,313.75 km) |
