| Potomac to Selargius | 4,429.86 mi (7,129.18 km) |
| Potomac to Selvazzano Dentro | 4,335.77 mi (6,977.74 km) |
| Potomac to Senago | 4,216.22 mi (6,785.35 km) |
| Potomac to Senigallia | 4,454.47 mi (7,168.77 km) |
| Potomac to Seravezza | 4,315.51 mi (6,945.14 km) |
| Potomac to Seregno | 4,216.95 mi (6,786.52 km) |
| Potomac to Seriate | 4,237.96 mi (6,820.34 km) |
| Potomac to Sermoneta | 4,521.07 mi (7,275.97 km) |
| Potomac to Serramanna | 4,412.94 mi (7,101.94 km) |
| Potomac to Serravalle Pistoiese | 4,344.95 mi (6,992.52 km) |
| Potomac to Sessa Aurunca | 4,574.48 mi (7,361.91 km) |
| Potomac to Sesto Calende | 4,190.02 mi (6,743.18 km) |
| Potomac to Sesto Fiorentino | 4,363.13 mi (7,021.78 km) |
| Potomac to Sesto San Giovanni | 4,222.11 mi (6,794.83 km) |
| Potomac to Sestri Levante | 4,269.90 mi (6,871.73 km) |
