| Potomac to Sierpc | 4,388.45 mi (7,062.53 km) |
| Potomac to Skarzysko-Kamienna | 4,497.21 mi (7,237.55 km) |
| Potomac to Skawina | 4,498.18 mi (7,239.12 km) |
| Potomac to Skierniewice | 4,438.38 mi (7,142.89 km) |
| Potomac to Skoczow | 4,465.11 mi (7,185.89 km) |
| Potomac to Skwierzyna | 4,245.86 mi (6,833.05 km) |
| Potomac to Slawno | 4,231.75 mi (6,810.34 km) |
| Potomac to Slubice | 4,219.10 mi (6,789.99 km) |
| Potomac to Slupca | 4,343.20 mi (6,989.70 km) |
| Potomac to Slupsk | 4,240.85 mi (6,824.99 km) |
| Potomac to Sochaczew | 4,431.88 mi (7,132.43 km) |
| Potomac to Sokolka | 4,505.04 mi (7,250.16 km) |
| Potomac to Sokolow Podlaski | 4,498.28 mi (7,239.29 km) |
| Potomac to Solec Kujawski | 4,329.89 mi (6,968.29 km) |
| Potomac to Sopot | 4,295.62 mi (6,913.13 km) |
